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Day 25: JEE Mains Chemistry

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

  1. Question 1

    Organic Chemistry - Some Basic Principles and Techniques. This type asked 5 times: 25 Jul 2022, 29 Jan 2023, 12 Apr 2023, 5 Apr 2024, 9 Apr 2024. This one: 9 Apr 2024 See all 5 of this type

    146
    In the given TLC, the distance of spot A& BA\&\text{ }B are 5 cm&7 cm5\text{ }cm\& 7\text{ }cm, from the bottom of TLC plate, respectively. RfR_{f} value of BB is x×10−1x \times10^{- 1} times more than AA. The value of xx is ______ .

  2. Question 2

    Amines. This type asked 5 times: 2021 Paper 10, 2021 Paper 25, 31 Jan 2023, 10 Apr 2023, 6 Apr 2024. This one: 6 Apr 2024 See all 5 of this type

    141
    An amine (X)(X) is prepared by ammonolysis of benzyl chloride. On adding p-toluenesulphonyl chloride to it the solution remains clear. Molar mass of the amine (X)(X) formed is _____ gmol−1gmol^{- 1}. (Given molar mass in gmol−1C:12,H:1,O:16, N:14gmol^{- 1}C:12,H:1,O:16,\text{ }N:14 )

  3. Question 3

    Solutions. This type asked 5 times: 30 Jan 2023, 1 Feb 2023, 13 Apr 2023, 5 Apr 2024, 6 Apr 2024. This one: 6 Apr 2024 See all 5 of this type

    51
    Consider the dissociation of the weak acid HX as given below
    HX(aq)⇌H+(aq)+X−(aq),Ka=1.2×10−5HX(aq) \rightleftharpoons H^{+}(aq) +X^{-}(aq),Ka = 1.2 \times10^{- 5}
    [Ka:\left\lbrack K_{a}: \right. dissociation constant ]\rbrack The osmotic pressure of 0.03M0.03M aqueous solution of HXHX at 300 K300\text{ }K is ____ ×10−2\times10^{- 2} bar (nearest integer). [Given: R=0.083 LbarMol−1 K−1R = 0.083\text{ }LbarMol^{- 1}{\text{ }K}^{- 1} ]

  4. Question 4

    Chemical Bonding and Molecular Structure. This type asked 5 times: 25 Jun 2022, 27 Jan 2024, 29 Jan 2024, 4 Apr 2024, 5 Apr 2024. This one: 5 Apr 2024 See all 5 of this type

    150
    Number of compounds from the following with zero dipole moment is ____ . HF,H2,H2 S,CO2,NH3,BF3,CH4,CHCl3,SiF4HF,H_{2},H_{2}\text{ }S,CO_{2},NH_{3},BF_{3},CH_{4},CHCl_{3},SiF_{4}, H2O,BeF2H_{2}O,BeF_{2}

  5. Question 5

    Chemical Thermodynamics. This type asked 5 times: 26 Jun 2022, 28 Jun 2022, 26 Jul 2022, 8 Apr 2023, 5 Apr 2024. This one: 5 Apr 2024 See all 5 of this type

    53
    The heat of combustion of solid benzoic acid at constant volume is −321.30 kJ- 321.30\text{ }kJ at 27∘C27^{\circ}C. The heat of combustion at constant pressure is (−321.30−xR)( - 321.30 - xR) kJkJ, the value of xx is ______