Chemistry · Textbook solutions

Chemical Kinetics

Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. Plus every board question asked from this chapter. · 49 questions

Worked Examples

10 q

Solved Examples

Worked · 10

Eg 3.1 $\text{C}_4\text{H}_9\text{Cl}$
Eg 3.2 $\text{N}_2\text{O}_5$
Eg 3.3 $= k\,[\text{A}]^{1/2}\,[\text{B}]^{3/2}$
Eg 3.4 $k = 2.3 \times 10^{-5}\,\text{L mol}^{-1}\text{s}^{-1}$
Eg 3.5 $\text{N}_2\text{O}_5$
Eg 3.6 $\text{N}_2\text{O}_5(g)$
Eg 3.7 $k = 5.5 \times 10^{-14}\,\text{s}^{-1}$
Eg 3.8 $(t_{1/2})$
Eg 3.9 $0.02\,\text{s}^{-1}$
Eg 3.10 $\text{C}_2\text{H}_5\text{I(g)} \rightarrow \text{C}_2\text{H}_4\text{(g)} + \text{HI(g)}$

$t/\text{s}$	0	50	100	150	200	300	400	700	800
$[\text{C}_4\text{H}_9\text{Cl}]/\text{mol L}^{-1}$	0.100	0.0905	0.0820	0.0741	0.0671	0.0549	0.0439	0.0210	0.017

S.No.	Time/s	Total Pressure/(atm)
1.	$0$	$0.5$
2.	$100$	$0.512$

Intext Questions

9 q

Intext 3.1 $\text{R} \rightarrow \text{P}$
Intext 3.2 $2\text{A} \rightarrow$
Intext 3.3 $\text{A} + \text{B} \rightarrow \text{Product}$
Intext 3.4 $The conversion of molecules X to Y follows second order kinetics. If concentration of X is increased to three times how will it affect the rate of formation of Y ?$
Intext 3.5 $1.15 \times 10^{-3}\,\text{s}^{-1}$
Intext 3.6 $\text{SO}_2\text{Cl}_2$
Intext 3.7 $What will be the effect of temperature on rate constant ?$
Intext 3.8 $E_a$
Intext 3.9 $2\,\text{HI(g)} \rightarrow \text{H}_2 + \text{I}_2\text{(g)}$

Exercises

30 q

Ex 3.1 $3\text{NO}(g) \rightarrow \text{N}_2\text{O}(g)$
Ex 3.2 $2\text{A} + \text{B} \rightarrow \text{A}_2\text{B}$
Ex 3.3 $\text{NH}_3$
Ex 3.4 $\text{CH}_4$
Ex 3.5 $Mention the factors that affect the rate of a chemical reaction.$
Ex 3.6 $A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is (i) doubled (ii) reduced to half ?$
Ex 3.7 $What is the effect of temperature on the rate constant of a reaction? How can this effect of temperature on rate constant be represented quantitatively?$
Ex 3.8 $t/\text{s}$
Ex 3.9 $A reaction is first order in A and second order in B. (i) Write the differential rate equation. (ii) How is the rate affected on increasing the concentration of B three times? (iii) How is the rate affected when the concentrations of both A and B are doubled?$

$t/\text{s}$	0	30	60	90
$[\text{A}]/\text{mol L}^{-1}$	0.55	0.31	0.17	0.085

Ex 3.10

(r_0)

$\text{A}/\text{mol L}^{-1}$	0.20	0.20	0.40
$\text{B}/\text{mol L}^{-1}$	0.30	0.10	0.05
$r_0/\text{mol L}^{-1}\text{s}^{-1}$	$5.07 \times 10^{-5}$	$5.07 \times 10^{-5}$	$1.43 \times 10^{-4}$

Ex 3.11

2\text{A} + \text{B} \rightarrow \text{C} + \text{D}

Experiment	$[\text{A}]/\text{mol L}^{-1}$	$[\text{B}]/\text{mol L}^{-1}$	Initial rate of formation of $\text{D}/\text{mol L}^{-1}\text{min}^{-1}$
I	0.1	0.1	$6.0 \times 10^{-3}$
II	0.3	0.2	$7.2 \times 10^{-2}$
III	0.3	0.4	$2.88 \times 10^{-1}$
IV	0.4	0.1	$2.40 \times 10^{-2}$

Ex 3.12

[\text{A}]/\text{mol L}^{-1}

Ex 3.13 $200\,\text{s}^{-1}$
Ex 3.14 $^{14}\text{C}$
Ex 3.15 $\text{N}_2\text{O}_5$
Ex 3.16 $60\,\text{s}^{-1}$
Ex 3.17 $^{90}\text{Sr}$
Ex 3.18 $For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.$
Ex 3.19 $t_{1/2}$
Ex 3.20 $t$
Ex 3.21 $\text{SO}_2\text{Cl}_2$
Ex 3.22 $\text{N}_2\text{O}_5$
Ex 3.23 $2.418 \times 10^{-5}\,\text{s}^{-1}$
Ex 3.24 $\text{A} \rightarrow$
Ex 3.25 $t_{1/2} = 3.00$
Ex 3.26 $k = (4.5 \times 10^{11}\,\text{s}^{-1})\,e^{-28000\,\text{K}/T}$
Ex 3.27 $\text{H}_2\text{O}_2$
Ex 3.28 $k$
Ex 3.29 $A$
Ex 3.30 $The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction assuming that it does not change with temperature.$

Experiment	$[\text{A}]/\text{mol L}^{-1}$	$[\text{B}]/\text{mol L}^{-1}$	Initial rate/ $\text{mol L}^{-1}\text{min}^{-1}$
I	0.1	0.1	$2.0 \times 10^{-2}$
II	-	0.2	$4.0 \times 10^{-2}$
III	0.4	0.4	-
IV	-	0.2	$2.0 \times 10^{-2}$

$t/\text{s}$	0	400	800	1200	1600	2000	2400	2800	3200
$10^2 \times [\text{N}_2\text{O}_5]/\text{mol L}^{-1}$	1.63	1.36	1.14	0.93	0.78	0.64	0.53	0.43	0.35

$t$ (sec)	P(mm of Hg)
0	35.0
360	54.0
720	63.0

Experiment	Time/ $\text{s}^{-1}$	Total pressure/atm
1	0	0.5
2	100	0.6

$T/^\circ\text{C}$	0	20	40	60	80
$10^5 \times k/\text{s}^{-1}$	0.0787	1.70	25.7	178	2140

What the board has asked from this chapter

Questions per paper · 26 papers · 2022 to 2026

Bars average the full papers of each year. 69 further questions come from set variants and are listed below.

2026

33 q

1 $Which of the following curve represents the first order reaction ?$
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Integrated Rate Equations
2 $Identify the correct statement :$
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Factors Influencing Rate of a Reaction
3 $\mathrm{A} + 2\mathrm{B} \rightarrow$
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Factors Influencing Rate of a Reaction
4 $\mathrm{E_a}$
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Temperature Dependence of the Rate of a Reaction
4 $\mathrm{N_2 + 3H_2 \longrightarrow 2NH_3}$
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Rate of a Chemical Reaction
7 $\mathrm{(t_{1/2})}$
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Integrated Rate Equations
10 $5{\cdot}6 \times 10^{-4}$
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Factors Influencing Rate of a Reaction
11 $\mathrm{3A \rightarrow 2B}$
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Rate of a Chemical Reaction
11 $\mathrm{NH_3}$
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Integrated Rate Equations
11 $The activation energy of a reaction can be determined from the slope of which of the following curves ?$
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Temperature Dependence of the Rate of a Reaction
12 $\mathrm{2A \rightarrow 3B}$
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Rate of a Chemical Reaction
For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :
13 $2\mathrm{HI} \longrightarrow \mathrm{H_2} + \mathrm{I_2}$
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Factors Influencing Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
15 $Assertion (A) : For complex reaction, order of reaction is given by the slowest step. Reason (R) : Order of reaction is not applicable for the complex reaction.$
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Factors Influencing Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
15 $Assertion (A) : For complex reaction, order of reaction is given by the slowest step. Reason (R) : Order of a reaction is an experimental quantity.$
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Factors Influencing Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
15 $Assertion (A) : For complex reaction, order of reaction is given by the fast step. Reason (R) : Order of reaction is determined experimentally.$
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Factors Influencing Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :
16 $Assertion (A) : Order of reaction is applicable to elementary as well as complex reactions. Reason (R) : For a complex reaction, molecularity has no meaning.$
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Factors Influencing Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :
16 $Assertion (A) : Order of reaction is applicable to elementary as well as complex reactions. Reason (R) : Order of a reaction is an experimental quantity.$
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Factors Influencing Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :
16 $Assertion (A) : Order of reaction is not applicable for elementary reaction but applicable for complex reaction. Reason (R) : Order of reaction is an experimental quantity.$
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Factors Influencing Rate of a Reaction
17 $(a) Reactions of which order will show the rate to be independent of the concentration of the reactant ? Give one example of this order. (b) State the condition under which a bimolecular reaction may be kinetically a first order reaction.$
Integrated Rate Equations
17 (A) $\mathrm{L^{-1}}$
Integrated Rate Equations
18 $\mathrm{A + B \rightarrow Products}$
Factors Influencing Rate of a Reaction
18 $(a) Define Effective collision. (b) Write the unit of (i) second order reaction and (ii) zero order reaction$
Collision Theory of Chemical Reactions
18 $(a) Define Collision frequency. (b) Write the units of (i) first order reaction and (ii) zero order reaction$
Collision Theory of Chemical Reactions
17 (B) $2.54 \times 10^{-3}$
Integrated Rate Equations
18 $(a) Define activation energy. (b) Write the unit of rate constant for (i) zero order reaction, (ii) second order reaction.$
Temperature Dependence of the Rate of a Reaction
21 $\mathrm{2A + B \longrightarrow 2C}$
Factors Influencing Rate of a Reaction
22 $1{\cdot}5 \times 10^{10}$
Integrated Rate Equations
22 $\mathrm{C_2H_5Cl(g) \longrightarrow C_2H_4(g) + HCl(g)}$
Integrated Rate Equations
23 $\mathrm{A + B \rightarrow C}$
Factors Influencing Rate of a Reaction
24 $\mathrm{(E_a)}$
Temperature Dependence of the Rate of a Reaction
24 $\mathrm{(E_a)}$
Temperature Dependence of the Rate of a Reaction
24 $\mathrm{(E_a)}$
Temperature Dependence of the Rate of a Reaction
27 $\mathrm{(H_2O_2)}$
Factors Influencing Rate of a Reaction

p (torr)	704	75	$34{\cdot}5$
$\mathrm{t_{1/2}}$ (min)	80	80	80

S. No.	Time(s)	Total Pressure (atm)
1	0	0.30
2	30	0.50

2025

41 q

1 $The role of a catalyst is to change :$
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Factors Influencing Rate of a Reaction
2 $Which among the following is a false statement ?$
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Factors Influencing Rate of a Reaction
3 $The number of molecules that react with each other in an elementary reaction is a measure of the :$
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Factors Influencing Rate of a Reaction
4 $(\mathrm{E_a})$
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Temperature Dependence of the Rate of a Reaction
4 $\ln [\mathrm{R}]$
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Integrated Rate Equations
4 $Unit of rate constant ‘k’ for a second order reaction is :$
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Factors Influencing Rate of a Reaction
5 $\mathrm{E_a}$
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Temperature Dependence of the Rate of a Reaction
5 $[\mathrm{R}]$
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Integrated Rate Equations
11 $The value of rate constant for a pseudo first order reaction :$
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Integrated Rate Equations
11 $\mathrm{k = Ae^{-E_a/RT}}$
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Temperature Dependence of the Rate of a Reaction
11 $The unit of rate and rate constant are same for a :$
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Rate of a Chemical Reaction
For question number 13 to 16, two statements are given - one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :
13 $Assertion (A) : In a first order reaction, if the concentration of the reactant is doubled, its half-life is also doubled. Reason (R) : The half-life of a reaction does not depend upon the initial concentration of the reactant in a first order reaction.$
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Integrated Rate Equations
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
14 $Assertion (A) : Hydrolysis of an ester follows first order kinetics. Reason (R) : The concentration of water does not get altered much during the reaction.$
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Integrated Rate Equations
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
14 $Assertion (A) : Order of the reaction can be zero or fractional. Reason (R) : We cannot determine order from balanced chemical equation.$
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Factors Influencing Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
14 $Assertion (A) : Molecularity of reaction is determined experimentally. Reason (R) : Molecularity is applicable only for an elementary reaction and not for a complex reaction.$
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Factors Influencing Rate of a Reaction
17 (A) $\mathrm{A} \rightarrow \mathrm{P}$
Integrated Rate Equations
17 (a) $0{\cdot}40$
Integrated Rate Equations
18 $Observe the graph in the given figure and answer the following questions : (a) Predict the order of reaction. (b) What is the slope of the curve ?$
Integrated Rate Equations
18 $Why is molecularity applicable only for elementary reactions and order is applicable for elementary as well as complex reactions ?$
Factors Influencing Rate of a Reaction
18 $A reaction is of second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is (i) doubled (ii) reduced to half ?$
Factors Influencing Rate of a Reaction
17 (B) $\mathrm{NH_3}$
Rate of a Chemical Reaction
17 (b) $\mathrm{H_2\,(g)}$
Factors Influencing Rate of a Reaction
18 $\mathrm{s^{-1}}$
Factors Influencing Rate of a Reaction
18 $State a condition under which a bimolecular reaction is kinetically first order reaction. Give an example. For which type of reactions, do order and molecularity have the same value ?$
Integrated Rate Equations
18 $\mathrm{(t_{1/2})}$
Integrated Rate Equations
19 $\mathrm{X} + \mathrm{Y} \rightarrow \mathrm{Z}$
Factors Influencing Rate of a Reaction
19 $4{\cdot}5 \times 10^{-5}$
Factors Influencing Rate of a Reaction
19 $2\mathrm{HI} \rightarrow \mathrm{H_2} + \mathrm{I_2}$
Factors Influencing Rate of a Reaction
21 (a) $\mathrm{A_2\,(g)}$
Factors Influencing Rate of a Reaction
21 (b) $0{\cdot}88$
Integrated Rate Equations

Time / Hours	[A]/M
0	$0{\cdot}40$
1	$0{\cdot}20$
2	$0{\cdot}10$
3	$0{\cdot}05$

Time / Hours	[A]/M
0	$0{\cdot}88$
1	$0{\cdot}44$
2	$0{\cdot}22$
3	$0{\cdot}11$

\longrightarrow

Experiment	[A] / mol $\mathrm{L^{-1}}$	[B] / mol $\mathrm{L^{-1}}$	Initial Rate/mol $\mathrm{L^{-1}\,min^{-1}}$
1	$0{\cdot}01$	$0{\cdot}01$	$5 \times 10^{-3}$
2	$0{\cdot}02$	$0{\cdot}01$	$1 \times 10^{-2}$
3	$0{\cdot}01$	$0{\cdot}02$	$5 \times 10^{-3}$

Factors Influencing Rate of a Reaction

\mathrm{A} + \mathrm{B} \rightarrow

Sl. No.	$\mathrm{[A]/mol\ L^{-1}}$	$\mathrm{[B]/mol\ L^{-1}}$	Initial rate $\mathrm{/mol\ L^{-1}\,s^{-1}}$
1	$0{\cdot}1$	$0{\cdot}1$	$0{\cdot}05$
2	$0{\cdot}2$	$0{\cdot}1$	$0{\cdot}10$
3	$0{\cdot}1$	$0{\cdot}2$	$0{\cdot}05$

Factors Influencing Rate of a Reaction

24 $\mathrm{K^{-1}\ mol^{-1}}$
Temperature Dependence of the Rate of a Reaction
24 $\mathrm{K^{-1}\ mol^{-1}}$
Temperature Dependence of the Rate of a Reaction
24 $\mathrm{N_2O_5\,(g)}$
Integrated Rate Equations
The rate of a chemical reaction is expressed either in terms of decrease in the concentration of reactants or increase in the concentration of a product per unit time. Rate of the reaction depends upon the nature of reactants, concentration of reactants, temperature, presence of catalyst, surface area of the reactants and presence of light. Rate of reaction is directly related to the concentration of reactant. Rate law states that the rate of reaction depends upon the concentration terms on which the rate of reaction actually depends, as observed experimentally. The sum of powers of the concentration of the reactants in the Rate law expression is called order of reaction while the number of reacting species taking part in an elementary reaction which must collide simultaneously in order to bring about a chemical reaction is called molecularity of the reaction.
29 (a) $(i) What is a rate determining step ? (ii) Define complex reaction.$
Factors Influencing Rate of a Reaction
The rate of a chemical reaction is expressed either in terms of decrease in the concentration of reactants or increase in the concentration of a product per unit time. Rate of the reaction depends upon the nature of reactants, concentration of reactants, temperature, presence of catalyst, surface area of the reactants and presence of light. Rate of reaction is directly related to the concentration of reactant. Rate law states that the rate of reaction depends upon the concentration terms on which the rate of reaction actually depends, as observed experimentally. The sum of powers of the concentration of the reactants in the Rate law expression is called order of reaction while the number of reacting species taking part in an elementary reaction which must collide simultaneously in order to bring about a chemical reaction is called molecularity of the reaction.
29 (b) $What is the effect of temperature on the rate constant of a reaction ?$
Temperature Dependence of the Rate of a Reaction
The rate of a chemical reaction is expressed either in terms of decrease in the concentration of reactants or increase in the concentration of a product per unit time. Rate of the reaction depends upon the nature of reactants, concentration of reactants, temperature, presence of catalyst, surface area of the reactants and presence of light. Rate of reaction is directly related to the concentration of reactant. Rate law states that the rate of reaction depends upon the concentration terms on which the rate of reaction actually depends, as observed experimentally. The sum of powers of the concentration of the reactants in the Rate law expression is called order of reaction while the number of reacting species taking part in an elementary reaction which must collide simultaneously in order to bring about a chemical reaction is called molecularity of the reaction.
29 (b) OR $Why is molecularity applicable only for elementary reactions whereas order is applicable for elementary as well as complex reactions ?$
Factors Influencing Rate of a Reaction
The rate of a chemical reaction is expressed either in terms of decrease in the concentration of reactants or increase in the concentration of a product per unit time. Rate of the reaction depends upon the nature of reactants, concentration of reactants, temperature, presence of catalyst, surface area of the reactants and presence of light. Rate of reaction is directly related to the concentration of reactant. Rate law states that the rate of reaction depends upon the concentration terms on which the rate of reaction actually depends, as observed experimentally. The sum of powers of the concentration of the reactants in the Rate law expression is called order of reaction while the number of reacting species taking part in an elementary reaction which must collide simultaneously in order to bring about a chemical reaction is called molecularity of the reaction.
29 (c) $The conversion of molecule X to Y follows second order kinetics. If concentration of X is increased 3 times, how will it affect the rate of formation of Y ?$
Factors Influencing Rate of a Reaction
33 (a) $\mathrm{N_2O_5}$
Integrated Rate Equations
33 (b) $(\mathrm{E_a})$
Temperature Dependence of the Rate of a Reaction

S.No.	Time/s	Total Pressure/atm
1	0	$0{\cdot}5$
2	100	$0{\cdot}625$

2024

39 q

5 $\mathrm{X} + 2\mathrm{Y} \rightarrow \mathrm{P}$
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Rate of a Chemical Reaction
5 $A zero-order reaction is one whose rate is independent of :$
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Integrated Rate Equations
6 $\mathrm{A_2} + \mathrm{B_2} \longrightarrow 2\mathrm{AB}$
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Factors Influencing Rate of a Reaction
7 $In effective collisions the colliding molecules must have :$
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Collision Theory of Chemical Reactions
7 $The fraction of molecules having energy equal to or greater than activation energy is :$
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Temperature Dependence of the Rate of a Reaction
7 $The correct Mathematical expression of Arrhenius equation is$
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Temperature Dependence of the Rate of a Reaction
8 $The rate of a reaction increases sixteen times when the concentration of the reactant increases four times. The order of the reaction is$
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Factors Influencing Rate of a Reaction
9 $In the Arrhenius equation, when log k is plotted against 1/T, a straight line is obtained whose :$
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Temperature Dependence of the Rate of a Reaction
10 $When a catalyst increases the rate of a chemical reaction, then the rate constant (k) :$
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Factors Influencing Rate of a Reaction
10 $Half-life period of a first order reaction is 1386 seconds. The rate constant (k) of the reaction is :$
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Integrated Rate Equations
10 $In a given graph of zero order reaction, the slope and intercept are :$
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Integrated Rate Equations
10 $\mathrm{min^{-1}}$
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Integrated Rate Equations
10 $\mathrm{R} \longrightarrow$
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Integrated Rate Equations
11 $The addition of catalyst during a chemical reaction alters which of the following quantities of the reaction ?$
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Factors Influencing Rate of a Reaction
11 $\mathrm{A} \longrightarrow$
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Integrated Rate Equations
11 $When the initial concentration of a reactant is doubled in the reaction, the half life period remains same. The order of reaction is :$
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Integrated Rate Equations
12 $2\mathrm{A} + \mathrm{B_2} \longrightarrow 2\mathrm{AB}$
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Temperature Dependence of the Rate of a Reaction
12 $\mathrm{P} \rightarrow \mathrm{Q}$
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Factors Influencing Rate of a Reaction
12 $\mathrm{A + 2B \rightarrow C + D}$
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Factors Influencing Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
14 $Assertion (A) : Rate of reaction decreases with increase in temperature. Reason (R) : Number of effective collisions increases with increase in temperature.$
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Temperature Dependence of the Rate of a Reaction
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
14 $Assertion (A) : Rate of reaction increases with increase in temperature. Reason (R) : Number of effective collisions increase with increase in temperature.$
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Temperature Dependence of the Rate of a Reaction
For questions number 13 to 16, two statements are given one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :
14 $Assertion (A) : The units of rate constant of a zero order reaction and rate of reaction are the same. Reason (R) : In zero order reaction, the rate of reaction is independent of the concentration of reactants.$
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Integrated Rate Equations
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
14 $Assertion (A) : Order of reaction and molecularity are always same for complex reactions. Reason (R) : Order is determined experimentally and molecularity is applicable only for elementary reactions.$
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Factors Influencing Rate of a Reaction
17 $Define the following terms : (a) Molecularity of reaction (b) Complex reaction$
Factors Influencing Rate of a Reaction
17 $\mathrm{t_{1/2}}$
Integrated Rate Equations
17 $Define the following terms : (a) Order of a reaction (b) Activation energy$
Factors Influencing Rate of a Reaction
18 $Define molecularity of the reaction. State any one condition in which a bimolecular reaction may be kinetically of first order.$
Factors Influencing Rate of a Reaction
18 $1{\cdot}25 \times 10^{-3}\ \mathrm{s^{-1}}$
Integrated Rate Equations
18 $(a) In a reaction, if the concentration of reactant 'X' is tripled, the rate of reaction becomes twenty-seven times. What is the order of the reaction ? (b) State a condition under which a bimolecular reaction is kinetically a first-order reaction. Give an example of such a reaction.$
Factors Influencing Rate of a Reaction
19 $\rightarrow$
Integrated Rate Equations
20 $Show that in case of a first order reaction, the time taken for completion of 99% reaction is twice the time required for 90% completion of the reaction. (log 10 = 1)$
Integrated Rate Equations
21 $Write two differences between order of reaction and molecularity of reaction.$
Factors Influencing Rate of a Reaction
21 $A first order reaction takes 40 min for 75% decomposition. Calculate rate constant. [Given : log 2 = 0.30, log 4 = 0.60]$
Integrated Rate Equations

2\mathrm{NO\,(g)} + \mathrm{Br_2\,(g)} \rightarrow 2\mathrm{NOBr\,(g)}

Expt. No.	$\mathrm{[NO]/mol\ L^{-1}}$	$\mathrm{[Br_2]/mol\ L^{-1}}$	Initial Rate $\mathrm{(mol\ L^{-1}\,s^{-1})}$
1	$0{\cdot}05$	$0{\cdot}05$	$1{\cdot}0 \times 10^{-3}$
2	$0{\cdot}05$	$0{\cdot}15$	$3{\cdot}0 \times 10^{-3}$
3	$0{\cdot}15$	$0{\cdot}05$	$9{\cdot}0 \times 10^{-3}$

Factors Influencing Rate of a Reaction

24 $0{\cdot}30$
Integrated Rate Equations
27 $\mathrm{K^{-1}mol^{-1}}$
Temperature Dependence of the Rate of a Reaction
28 $17\,^{\circ}\mathrm{C}$
Temperature Dependence of the Rate of a Reaction
28 $\mathrm{K^{-1}\ mol^{-1}}$
Temperature Dependence of the Rate of a Reaction
28 $\mathrm{t_{1/2}}$
Integrated Rate Equations

2023

42 q

2 $The half-life for a zero order reaction equals : where R is the initial concentration.$
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Integrated Rate Equations
2 $\mathrm{A} \rightarrow$
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Integrated Rate Equations
2 $\mathrm{A} + 2\mathrm{B} \longrightarrow \mathrm{C} + \mathrm{D}$
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Factors Influencing Rate of a Reaction
4 $\log\dfrac{[\mathrm{R}]_\mathrm{o}}{[\mathrm{R}]}$
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Integrated Rate Equations
4 $\ln[\mathrm{R}]$
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Integrated Rate Equations
4 $[\mathrm{R}]$
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Integrated Rate Equations
4 $A first order reaction takes 30 minutes for 50% completion. The value of rate constant k would be :$
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Integrated Rate Equations
5 $Which of the following is affected by catalyst ?$
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Factors Influencing Rate of a Reaction
6 $\mathrm{H_2\,(g)} + \mathrm{Cl_2\,(g)} \xrightarrow{\ h\nu\ } 2\mathrm{HCl\,(g)}$
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Factors Influencing Rate of a Reaction
7 $The unit of the rate of reaction is the same as that of the rate constant for a :$
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Rate of a Chemical Reaction
7 $\mathrm{A} + \mathrm{B} \longrightarrow \text{Products}$
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Factors Influencing Rate of a Reaction
10 $The number of molecules that react with each other in an elementary reaction is a measure of the :$
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Factors Influencing Rate of a Reaction
10 $\frac{1}{4}$
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Integrated Rate Equations
10 $In a reaction, the initial concentration of the reactants increases four fold and the rate becomes sixteen times its initial value. The order of the reaction is :$
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Factors Influencing Rate of a Reaction
11 $The half-life of a reaction is doubled when the initial concentration is doubled. The order of the reaction is :$
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Integrated Rate Equations
12 $3\mathrm{A} \rightarrow 2\mathrm{B}$
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Rate of a Chemical Reaction
12 $2\mathrm{A} \rightarrow 3\mathrm{B}$
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Rate of a Chemical Reaction
12 $3\mathrm{A} \rightarrow 2\mathrm{B}$
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Rate of a Chemical Reaction

\mathrm{A_{(g)}} + \mathrm{B_{(g)}} \rightarrow \mathrm{C_{(g)}} + \mathrm{D_{(g)}}

Initial $[\mathrm{A_{(g)}}]$ /mol $\mathrm{dm^{-3}}$	Initial $[\mathrm{B_{(g)}}]$ /mol $\mathrm{dm^{-3}}$	Initial rate/mol $\mathrm{dm^{-3}s^{-1}}$
$3.0 \times 10^{-2}$	$2.0 \times 10^{-2}$	$1.89 \times 10^{-4}$
$3.0 \times 10^{-2}$	$4.0 \times 10^{-2}$	$1.89 \times 10^{-4}$
$6.0 \times 10^{-2}$	$4.0 \times 10^{-2}$	$7.56 \times 10^{-4}$

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Factors Influencing Rate of a Reaction

For Questions number 15 to 18, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
15 $Assertion (A) : Order and molecularity of a reaction are always same. Reason (R) : Complex reactions involve a sequence of elementary reactions and the slowest step is rate determining.$
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Factors Influencing Rate of a Reaction
For questions number 15 to 18, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below :
16 $Assertion (A) : For a zero order reaction the unit of rate constant and rate of reaction are same. Reason (R) : Rate of reaction for zero order reaction is independent of concentration of reactant.$
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Integrated Rate Equations
For questions number 15 to 18, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below :
16 $Assertion (A) : The half life of a reaction is the time in which the concentration of the reactant is reduced to one half of its initial concentration. Reason (R) : In first order kinetics when concentration of reactant is doubled, its half life is doubled.$
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Integrated Rate Equations
For questions number 15 to 18, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below :
16 $Assertion (A) : Order of reaction is applicable to elementary as well as complex reactions. Reason (R) : For a complex reaction molecularity has no meaning.$
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Factors Influencing Rate of a Reaction
For Questions number 15 to 18, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
17 $\mathrm{H_2} + \mathrm{Br_2} \longrightarrow 2\mathrm{HBr}$
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Factors Influencing Rate of a Reaction
20 $2\mathrm{N_2O_5\,(g)} \longrightarrow 4\mathrm{NO_2\,(g)} + \mathrm{O_2\,(g)}$
Rate of a Chemical Reaction
20 $0{\cdot}3010$
Integrated Rate Equations
20 $\mathrm{E_a}$
Temperature Dependence of the Rate of a Reaction
21 $(a) The conversion of molecule A to B followed second order kinetics. If concentration of A increased to three times, how will it affect the rate of formation of B ? (b) Define Pseudo first order reaction with an example.$
Factors Influencing Rate of a Reaction
22 $\mathrm{N_2O_5}$
Temperature Dependence of the Rate of a Reaction

2\mathrm{NO_2\,(g)} + \mathrm{F_2\,(g)} \longrightarrow 2\mathrm{NO_2F\,(g)}

Experiment No.	$[\mathrm{NO_2}]/\mathrm{M}$	$[\mathrm{F_2}]/\mathrm{M}$	Initial rate $\mathrm{M\ min^{-1}}$
1	$0{\cdot}2$	$0{\cdot}05$	$6 \times 10^{-3}$
2	$0{\cdot}4$	$0{\cdot}05$	$1{\cdot}2 \times 10^{-2}$
3	$0{\cdot}8$	$0{\cdot}10$	$4{\cdot}8 \times 10^{-2}$

Factors Influencing Rate of a Reaction

26 $2\mathrm{N_2O_{5(g)}} \rightarrow 4\mathrm{NO_{2(g)}} + \mathrm{O_{2(g)}}$
Integrated Rate Equations
28 $(\mathrm{E_a})$
Temperature Dependence of the Rate of a Reaction
29 $27^{\circ}\mathrm{C}$
Temperature Dependence of the Rate of a Reaction
30 $\mathrm{C_2H_5Cl}$
Integrated Rate Equations
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate Constant and order of a reaction can be determined from rate law or its integrated rate equation.
31 (i) $What is average rate of reaction ?$
Rate of a Chemical Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate constant and order of a reaction can be determined from rate law or its integrated rate equation.
31 (i) $What is average rate of reaction ?$
Rate of a Chemical Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate constant and order of a reaction can be determined from rate law or its integrated rate equation.
31 (ii) $Write two factors that affect the rate of reaction.$
Factors Influencing Rate of a Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate Constant and order of a reaction can be determined from rate law or its integrated rate equation.
31 (ii) $Write two factors that affect the rate of reaction.$
Factors Influencing Rate of a Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate Constant and order of a reaction can be determined from rate law or its integrated rate equation.
31 (iii) (a) $(1) What happens to rate of reaction for zero order reaction ? (2) What is the unit of k for zero order reaction ?$
Integrated Rate Equations
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate constant and order of a reaction can be determined from rate law or its integrated rate equation.
31 (iii) (a) $(1) What happens to rate of reaction for zero order reaction ? (2) What is the unit of k for zero order reaction ?$
Integrated Rate Equations
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate Constant and order of a reaction can be determined from rate law or its integrated rate equation.
31 (iii) (b) $\mathrm{P} + 2\mathrm{Q} \longrightarrow \text{Products}$
Factors Influencing Rate of a Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate constant and order of a reaction can be determined from rate law or its integrated rate equation.
31 (iii) (b) $\mathrm{P} + 2\mathrm{Q} \longrightarrow \text{Products}$
Factors Influencing Rate of a Reaction

Experiment	Time ( $\mathrm{s^{-1}}$ )	Total pressure (atm)
1	0	$0{\cdot}4$
2	100	$0{\cdot}6$

2022

21 q

1 $(a) A reaction is second order in X and first order in Y. How is the rate affected when the concentrations of both X and Y are doubled ? (b) Write the units of 'k' for (i) zero order reaction (ii) first order reaction$
Factors Influencing Rate of a Reaction
1 $Define rate of reaction. Write two factors that affect the rate of reaction.$
Rate of a Chemical Reaction
1 $\mathrm{Lmol^{-1}s^{-1}}$
Integrated Rate Equations
2 $\mathrm{N_2\,(g)} + 3\mathrm{H_2\,(g)} \longrightarrow 2\mathrm{NH_3\,(g)}$
Rate of a Chemical Reaction
3 $2\mathrm{N_2O_5\,(g)} \longrightarrow 4\mathrm{NO_2\,(g)} + \mathrm{O_2\,(g)}$
Rate of a Chemical Reaction
3 $A reaction is first order in X and second order in Y. (i) How is the rate affected on increasing the concentration of Y three times ? (ii) How is the rate affected when the concentrations of both X and Y are doubled ?$
Factors Influencing Rate of a Reaction
3 $What do you mean by complex reactions ? Can we determine order and molecularity of a complex reaction ?$
Factors Influencing Rate of a Reaction
4 $k$
Integrated Rate Equations
6 $A first order reaction is 50% complete in 40 minutes. Calculate the time required for the completion of 90% of reaction. [Given : log 2 = 0.3010, log 10 = 1]$
Integrated Rate Equations
7 $k$
Integrated Rate Equations
7 $t_{1/2}$
Integrated Rate Equations
The rate law for a chemical reaction relates the reaction rate with the concentrations or partial pressures of the reactants. For a general reaction aA + bB $\rightarrow$ C with no intermediate steps in its reaction mechanism, meaning that it is an elementary reaction, the rate law is given by $r = k[\mathrm{A}]^{x}[\mathrm{B}]^{y}$ , where [A] and [B] express the concentrations of A and B in moles per litre. Exponents x and y vary for each reaction and are determined experimentally. The value of k varies with conditions that affect reaction rate, such as temperature, pressure, surface area, etc. The sum of these exponents is known as overall reaction order. A zero order reaction has a constant rate that is independent of the concentration of the reactants. A first order reaction depends on the concentration of only one reactant. A reaction is said to be second order when the overall order is two. Once we have determined the order of the reaction, we can go back and plug in one set of our initial values and solve for k.
12 (i) $\text{Rate} = k[\mathrm{A}]^{1/2}\,[\mathrm{B}]^{3/2}$
Factors Influencing Rate of a Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. A number of factors such as temperature, concentration of reactants, catalyst affect the rate of reaction. Mathematical representation of rate of a reaction is given by rate law : $\mathrm{Rate = k[A]^{x}\,[B]^{y}}$ x and y indicate how sensitive the rate is to the change in concentration of A and B. Sum of x + y gives the overall order of a reaction. When a sequence of elementary reactions gives us the products, the reactions are called complex reactions. Molecularity and order of an elementary reaction are same. Zero order reactions are relatively uncommon but they occur under special conditions. All natural and artificial radioactive decay of unstable nuclei take place by first order kinetics.
12 (a) $What is the effect of temperature on the rate constant of a reaction ?$
Temperature Dependence of the Rate of a Reaction
The rate law for a chemical reaction relates the reaction rate with the concentrations or partial pressures of the reactants. For a general reaction aA + bB $\rightarrow$ C with no intermediate steps in its reaction mechanism, meaning that it is an elementary reaction, the rate law is given by $r = k[\mathrm{A}]^{x}[\mathrm{B}]^{y}$ , where [A] and [B] express the concentrations of A and B in moles per litre. Exponents x and y vary for each reaction and are determined experimentally. The value of k varies with conditions that affect reaction rate, such as temperature, pressure, surface area, etc. The sum of these exponents is known as overall reaction order. A zero order reaction has a constant rate that is independent of the concentration of the reactants. A first order reaction depends on the concentration of only one reactant. A reaction is said to be second order when the overall order is two. Once we have determined the order of the reaction, we can go back and plug in one set of our initial values and solve for k.
12 (ii) $What is the effect of temperature on rate of reaction ?$
Temperature Dependence of the Rate of a Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. A number of factors such as temperature, concentration of reactants, catalyst affect the rate of reaction. Mathematical representation of rate of a reaction is given by rate law : $\mathrm{Rate = k[A]^{x}\,[B]^{y}}$ x and y indicate how sensitive the rate is to the change in concentration of A and B. Sum of x + y gives the overall order of a reaction. When a sequence of elementary reactions gives us the products, the reactions are called complex reactions. Molecularity and order of an elementary reaction are same. Zero order reactions are relatively uncommon but they occur under special conditions. All natural and artificial radioactive decay of unstable nuclei take place by first order kinetics.
12 (b) $\rightarrow$
Factors Influencing Rate of a Reaction
The rate law for a chemical reaction relates the reaction rate with the concentrations or partial pressures of the reactants. For a general reaction aA + bB $\rightarrow$ C with no intermediate steps in its reaction mechanism, meaning that it is an elementary reaction, the rate law is given by $r = k[\mathrm{A}]^{x}[\mathrm{B}]^{y}$ , where [A] and [B] express the concentrations of A and B in moles per litre. Exponents x and y vary for each reaction and are determined experimentally. The value of k varies with conditions that affect reaction rate, such as temperature, pressure, surface area, etc. The sum of these exponents is known as overall reaction order. A zero order reaction has a constant rate that is independent of the concentration of the reactants. A first order reaction depends on the concentration of only one reactant. A reaction is said to be second order when the overall order is two. Once we have determined the order of the reaction, we can go back and plug in one set of our initial values and solve for k.
12 (iii) $What is meant by rate of a reaction ?$
Rate of a Chemical Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. A number of factors such as temperature, concentration of reactants, catalyst affect the rate of reaction. Mathematical representation of rate of a reaction is given by rate law : $\mathrm{Rate = k[A]^{x}\,[B]^{y}}$ x and y indicate how sensitive the rate is to the change in concentration of A and B. Sum of x + y gives the overall order of a reaction. When a sequence of elementary reactions gives us the products, the reactions are called complex reactions. Molecularity and order of an elementary reaction are same. Zero order reactions are relatively uncommon but they occur under special conditions. All natural and artificial radioactive decay of unstable nuclei take place by first order kinetics.
12 (c) $How order and molecularity are different for complex reactions ?$
Factors Influencing Rate of a Reaction
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. A number of factors such as temperature, concentration of reactants, catalyst affect the rate of reaction. Mathematical representation of rate of a reaction is given by rate law : $\mathrm{Rate = k[A]^{x}\,[B]^{y}}$ x and y indicate how sensitive the rate is to the change in concentration of A and B. Sum of x + y gives the overall order of a reaction. When a sequence of elementary reactions gives us the products, the reactions are called complex reactions. Molecularity and order of an elementary reaction are same. Zero order reactions are relatively uncommon but they occur under special conditions. All natural and artificial radioactive decay of unstable nuclei take place by first order kinetics.
12 (d) $2 \times 10^{-3}\mathrm{s^{-1}}$
Integrated Rate Equations
The rate law for a chemical reaction relates the reaction rate with the concentrations or partial pressures of the reactants. For a general reaction aA + bB $\rightarrow$ C with no intermediate steps in its reaction mechanism, meaning that it is an elementary reaction, the rate law is given by $r = k[\mathrm{A}]^{x}[\mathrm{B}]^{y}$ , where [A] and [B] express the concentrations of A and B in moles per litre. Exponents x and y vary for each reaction and are determined experimentally. The value of k varies with conditions that affect reaction rate, such as temperature, pressure, surface area, etc. The sum of these exponents is known as overall reaction order. A zero order reaction has a constant rate that is independent of the concentration of the reactants. A first order reaction depends on the concentration of only one reactant. A reaction is said to be second order when the overall order is two. Once we have determined the order of the reaction, we can go back and plug in one set of our initial values and solve for k.
12 (iv) (a) $77{\cdot}78$
Integrated Rate Equations
The rate law for a chemical reaction relates the reaction rate with the concentrations or partial pressures of the reactants. For a general reaction aA + bB $\rightarrow$ C with no intermediate steps in its reaction mechanism, meaning that it is an elementary reaction, the rate law is given by $r = k[\mathrm{A}]^{x}[\mathrm{B}]^{y}$ , where [A] and [B] express the concentrations of A and B in moles per litre. Exponents x and y vary for each reaction and are determined experimentally. The value of k varies with conditions that affect reaction rate, such as temperature, pressure, surface area, etc. The sum of these exponents is known as overall reaction order. A zero order reaction has a constant rate that is independent of the concentration of the reactants. A first order reaction depends on the concentration of only one reactant. A reaction is said to be second order when the overall order is two. Once we have determined the order of the reaction, we can go back and plug in one set of our initial values and solve for k.
12 (iv) (b) $1 \times 10^{-3}$
Integrated Rate Equations
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. A number of factors such as temperature, concentration of reactants, catalyst affect the rate of reaction. Mathematical representation of rate of a reaction is given by rate law : $\mathrm{Rate = k[A]^{x}\,[B]^{y}}$ x and y indicate how sensitive the rate is to the change in concentration of A and B. Sum of x + y gives the overall order of a reaction. When a sequence of elementary reactions gives us the products, the reactions are called complex reactions. Molecularity and order of an elementary reaction are same. Zero order reactions are relatively uncommon but they occur under special conditions. All natural and artificial radioactive decay of unstable nuclei take place by first order kinetics.
12 (d) OR $^{14}\mathrm{C}$
Integrated Rate Equations

The 10 board questions to practise first

The questions the board asked again come first, most asked first. Each one says how often and when.

Question 1
Asked 3 times: 2024, 2025*, 2026 (* = numbers or wording changed that year)
24 $\mathrm{(E_a)}$
Question 2
Asked 3 times: 2024, 2025, 2026
4 $\mathrm{E_a}$
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Question 3
Asked 3 times: 2023, 2024, 2025
1 $The role of a catalyst is to change :$
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Question 4
Asked 2 times: 2023, 2026
11 $\mathrm{3A \rightarrow 2B}$
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Question 5
Asked 2 times: 2023, 2026
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
16 $Assertion (A) : Order of reaction is applicable to elementary as well as complex reactions. Reason (R) : For a complex reaction, molecularity has no meaning.$
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Question 6
Asked 2 times: 2024, 2026
7 $\mathrm{(t_{1/2})}$
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Question 7
Asked 2 times: 2023*, 2026 (* = numbers or wording changed that year)
22 $\mathrm{C_2H_5Cl(g) \longrightarrow C_2H_4(g) + HCl(g)}$
Question 8
Asked 2 times: 2025, 2026
11 $The activation energy of a reaction can be determined from the slope of which of the following curves ?$
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Question 9
Asked 2 times: 2023*, 2026 (* = numbers or wording changed that year)
24 $\mathrm{(E_a)}$
Question 10
Asked 2 times: 2023, 2025
3 $The number of molecules that react with each other in an elementary reaction is a measure of the :$
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Worked Examples

Solved Examples

Intext Questions

Exercises

What the board has asked from this chapter

2026

2025

2024

2023

2022

The 10 board questions to practise first

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10