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Day 39: JEE Mains Chemistry

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

  1. Question 1

    Solutions. This type asked 4 times: 2021 Paper 19, 2021 Paper 21, 28 Jul 2022, 3 Apr 2025. This one: 3 Apr 2025 See all 4 of this type

    41
    2 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is : (Given : Ebullioscopic constant of water =0.52 K kg mol−1= 0.52\text{ }K\text{ }kg{\text{ }mol}^{- 1} )

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  2. Question 2

    The d- and f-Block Elements. This type asked 4 times: 8 Apr 2024, 9 Apr 2024, 2 Apr 2025, 3 Apr 2025. This one: 3 Apr 2025 See all 4 of this type

    124
    Among, Sc,Mn,CoSc,Mn,Co and Cu , identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is ____ BM (in nearest integer).

  3. Question 3

    Chemical Thermodynamics. This type asked 4 times: 28 Jun 2022, 30 Jan 2023, 1 Feb 2024, 2 Apr 2025. This one: 2 Apr 2025 See all 4 of this type

    31
    Two vessels A and B are connected via stopcock. The vessel A is filled with a gas at a certain pressure. The entire assembly is immersed in water and is allowed to come to thermal equilibrium with water. After opening the stopcock the gas from vessel A expands into vessel BB and no change in temperature is observed in the thermometer. Which of the following statement is true?

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  4. Question 4

    Equilibrium. This type asked 4 times: 27 Jun 2022, 28 Jul 2022, 11 Apr 2023, 2 Apr 2025. This one: 2 Apr 2025 See all 4 of this type

    49
    Consider the following equilibrium,
    CO(g)+2H2( g)⇌CH3OH(g)CO(g) + 2H_{2}(\text{ }g) \rightleftharpoons {CH}_{3}OH(g)
    0.1 mol of CO along with a catalyst is present in a 2dm32{dm}^{3} flask maintained at 500 K . Hydrogen is introduced into the flask until the pressure is 5 bar and 0.04 mol of CH3OH{CH}_{3}OH is formed. The Kp∘K_{p}^{\circ} is ____\_\_\_\_ ×10−3\times 10^{- 3} (nearest integer). Given : R=0.08dm3R = 0.08{dm}^{3} bar K−1 mol−1K^{- 1}{\text{ }mol}^{- 1} Assume only methanol is formed as the product and the system follows ideal gas behaviour.

  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. This type asked 4 times: 29 Jun 2022, 25 Jul 2022, 24 Jan 2025, 2 Apr 2025. This one: 2 Apr 2025 See all 4 of this type

    106
    In 3,3-dimethylhex-1-en-4-yne, there are ___ sp3sp^{3}, ___ sp2sp^{2} and ___ spsp hybridised carbon atoms respectively:

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