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Day 118: JEE Mains Chemistry

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

  1. Question 1

    Chemical Kinetics. Asked once: 5 Apr 2026 S1 (same type asked 7 times) See all 7 of this type

    50
    If the half-life of a first order reaction is 6.93 minutes then the time required for completion of 99%99\% of the reaction will be ____\_\_\_\_ minutes. (Given : log⁡2=0.3010\log2 = 0.3010 )

  2. Question 2

    Solutions. Asked once: 23 Jan 2025 (same type asked 7 times) See all 7 of this type

    108
    When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm of Hg . The mole fraction of the solute in the solution is 0.2 . What would be the mole fraction of the solvent if decrease in vapour pressure is 20 mm of Hg ?

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  3. Question 3

    Equilibrium. Asked once: 23 Jan 2026 S1 (same type asked 7 times) See all 7 of this type

    47
    For the following gas phase equilibrium reaction at constant temperature,
    NH3(g)⇌12 N2(g)+32H2(g){NH}_{3}(g) \rightleftharpoons \frac{1}{2}{\text{ }N}_{2}(g) + \frac{3}{2}H_{2}(g)
    If the total pressure is 3 atm\sqrt{3}\text{ }atm and the pressure equilibrium constant (Kp)\left( K_{p} \right) is 9 atm , then the degree of dissociation is given as (x×10−2)−1/2\left( x \times 10^{- 2} \right)^{- 1/2}. The value of xx is ____\_\_\_\_ (Nearest integer)

  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 31 Jan 2023 (same type asked 7 times) See all 7 of this type

    31
    Match the items of Column I with Column II.
    Column I (Mixture of compounds)Column II (Separation technique)
    (A)H2O/CH2Cl2H_{2}O/CH_{2}Cl_{2}(i)Crystallization
    (B)1-Tetralone / 4-nitrophenol (structures in the figure)(ii)Differential extraction
    (C)Kerosene / Naphthalene(iii)Column chromatography
    (D)C6H12O6/NaClC_{6}H_{12}O_{6}/NaCl(iv)Fractional distillation
    The correct match is:

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  5. Question 5

    Chemical Thermodynamics. Asked once: 28 Jan 2025 (same type asked 7 times) See all 7 of this type

    122
    Consider the following data : Heat of formation of CO2( g)=−393.5 kJ mol−1CO_{2}(\text{ }g) = - 393.5\text{ }kJ{\text{ }mol}^{- 1} Heat of formation of H2O(l)=−286.0 kJ mol−1H_{2}O(l) = - 286.0\text{ }kJ{\text{ }mol}^{- 1} Heat of combustion of benzene =−3267.0 kJ mol−1= - 3267.0\text{ }kJ{\text{ }mol}^{- 1} The heat of formation of benzene is  ___\ \_\_\_ kJmol−1kJmol^{- 1}. (Nearest integer)