PYQ Vault
EbooksTutor

Day 50: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Equilibrium. This type asked 3 times: 2021 Paper 16, 2021 Paper 19, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 3 of this type

    32
    One mole each of He and A(g)A(g) are taken in a 10 L closed flask and heated to 400 K to establish the following equilibrium.
    A(g)⇌B(g)A(g) \rightleftharpoons B(g)
    KCK_{C} for this reaction at 400 K is 4.0. The partial pressures (in atm ) of He and B(g)B(g) are respectively (at equilibrium). (Assume He,A(g)He,A(g) and B(g)B(g) behave as ideal gases) (Given : R=0.082 L atm K−1 mol−1R = 0.082\text{ }L\text{ }atm{\text{ }K}^{- 1}{\text{ }mol}^{- 1} )

    Tap an option to check your answer.

  2. Question 2

    Biomolecules. This type asked 3 times: 4 Apr 2024, 5 Apr 2026 S1, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 3 of this type

    44
    Given below are two statements : Statement-I : The two structures shown are two anomers of D-(+)-glucose. Statement-II : The open chain forms of D-glucose and D-fructose contain three similar chiral carbons at C3,C4C_{3},C_{4} and C5C_{5}. In the light of the above statements, choose the correct answer from the options given below :

    Tap an option to check your answer.

  3. Question 3

    Chemical Thermodynamics. This type asked 3 times: 2021 Paper 24, 23 Jan 2025, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 3 of this type

    29
    Consider the following data for the reaction X2( g)+Y2( g)⇌2XY(g)X_{2}(\text{ }g) +Y_{2}(\text{ }g) \rightleftharpoons 2XY(g) at 600 K. The ΔrG⊖\Delta_{r}G^{\ominus} (in kJ mol−1kJ\,mol^{-1}) for the reaction is:
    Compound
    ΔfH600 KΘ\Delta_{f}H_{600\text{ }K}^{\Theta}
    (kJmol−1)\left( kJmol^{- 1} \right)
    S600 KΘS_{600\text{ }K}^{\Theta}
    (Jmol−1 K−1)\left( Jmol^{- 1}{\text{ }K}^{- 1} \right)
    XY(g)XY(g)
    		42200
    X2( g)X_{2}(\text{ }g)
    		8140
    Y2( g)Y_{2}(\text{ }g)
    		80250

    Tap an option to check your answer.

  4. Question 4

    Coordination Compounds. This type asked 3 times: 21 Jan 2026 S2, 22 Jan 2026 S1, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 3 of this type

    46
    The total number of unpaired electrons present in the d3, d4d^{3},{\text{ }d}^{4} (low spin) d5d^{5} (high spin), d6d^{6} (high spin) and d7d^{7} (low spin) octahedral complex systems is ____\_\_\_\_ .

  5. Question 5

    Chemical Kinetics. This type asked 3 times: 31 Jan 2024, 7 Apr 2025, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 3 of this type

    32
    First order gas phase reaction
    A→B+CA \rightarrow B + C
    pi=p_{i}= initial pressure of gas A, pt=p_{t}= total pressure of the reaction mixture at time t Expression of rate constant ( k ) is

    Tap an option to check your answer.