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Day 480: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 8 Apr 2024

    52
    Consider the figure provided. 1 mol1\text{ }mol of an ideal gas is kept in a cylinder, fitted with a piston, at the position AA, at 18∘C18^{\circ}C. If the piston is moved to position BB, keeping the temperature unchanged, then ' xx ' LL atm work is done in this reversible process. x=x = _______ LL atm. (nearest integer) [Given: Absolute temperature = ∘C+273.15=\ ^{\circ}C + 273.15, R=0.08206 L atm mol−1 K−1R = 0.08206\text{ }L\text{ }atm{\text{ }mol}^{- 1}{\text{ }K}^{- 1} ]

  2. Question 2

    Classification of Elements and Periodicity. Asked once: 1 Feb 2024

    57
    Lowest Oxidation number of an atom in a compound A2 BA_{2}\text{ }B is -2 . The number of an electron in its valence shell is

  3. Question 3

    Coordination Compounds. Asked once: 2021 Paper 9

    36
    Match List-I with List-II. Choose the correct answer from the options given below:

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  4. Question 4

    Electrochemistry. Asked once: 11 Apr 2023

    150
    The number of correct statements from the following is : (A) Ecell E_{\text{cell~}} is an intensive parameter. (B) A negative EΘE^{\Theta} means that the redox couple is a stronger reducing agent than the H+/H2H^{+}/H_{2} couple. (C) The amount of electricity required for oxidation or reduction depends on the stoichiometry of the electrode reaction. (D) The amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte.

  5. Question 5

    Equilibrium. Asked once: 25 Jul 2022

    123
    Ka1,Ka2Ka_{1},Ka_{2} and Ka3Ka_{3} are the respective ionization constants for the following reactions (a),(b), and (c)(c). (a) H2C2O4⇌H++HC2O4−H_{2}C_{2}O_{4}\rightleftharpoons H^{+}+HC_{2}O_{4}^{-} (b) HC2O4−⇌H++C2O42−HC_{2}O_{4}^{-}\rightleftharpoons H^{+}+C_{2}O_{4}^{2 -} (c) H2C2O4⇌2H++C2O42−H_{2}C_{2}O_{4}\rightleftharpoons 2H^{+}+C_{2}O_{4}^{2 -} The relationship between Ka1, Ka2K_{a_{1}},{\text{ }K}_{a_{2}} and Ka3K_{a_{3}} is given as

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