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Day 416: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 21 Jan 2026 S1

    44
    For the reaction, N2O4⇌2NO2N_{2}O_{4}\rightleftharpoons 2NO_{2}, graph is plotted as shown below. Identify correct statements. (A) Standard free energy change for the reaction is −5.40 kJ mol−1- 5.40\text{ }kJ{\text{ }mol}^{- 1}. (B) As AG⊖{AG}^{\ominus} in graph is positive, N2O4N_{2}O_{4} will not dissociate into NO2{NO}_{2} at all. (C) Reverse reaction will go to completion. (D) When 1 mole of N2O4N_{2}O_{4} changes into equilibrium mixture, value of ΔG⊖=−0.84 kJ mol−1\Delta G^{\ominus} = - 0.84\text{ }kJ{\text{ }mol}^{- 1} (E) When 2 mole of NO2{NO}_{2}, changes into equilibrium mixture, ΔG⊖\Delta G^{\ominus} for equilibrium mixture is −6.24 kJ mol−1- 6.24\text{ }kJ{\text{ }mol}^{- 1}. Choose the correct answer from the options given below :

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  2. Question 2

    Classification of Elements and Periodicity. Asked once: 23 Jan 2026 S2

    27
    It is noticed that Pb2+Pb^{2 +} is more stable than Pb4+Pb^{4 +} but Sn2+Sn^{2 +} is less stable than Sn4+Sn^{4 +}. Observe the following reactions
    PbO2+Pb→2PbO; ΔrG∘(1)PbO_{2}+ Pb \rightarrow 2PbO;\ \Delta_{r}G^{\circ}(1)
    SnO2+Sn→2SnO; ΔrG∘(2)SnO_{2}+ Sn \rightarrow 2SnO;\ \Delta_{r}G^{\circ}(2)
    Identify the correct set from the following.

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  3. Question 3

    Coordination Compounds. Asked once: 31 Jan 2024

    46
    The correct statements from following are: (A) The strength of anionic ligands can be explained by crystal field theory. (B) Valence bond theory does not give a quantitative interpretation of kinetic stability of coordination compounds. (C) The hybridization involved in formation of [Ni(CN)4]2−\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -} complex is dsp2dsp^{2}. (D) The number of possible isomer(s) of cis- [PtCl2(en)2]2+\left\lbrack PtCl_{2}(en)_{2} \right\rbrack^{2 +} is one Choose the correct answer from the options given below:

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  4. Question 4

    Electrochemistry. Asked once: 2 Apr 2025

    47
    Consider the following electrochemical cell at standard condition.
    Au( s)∣QH2,Q∣NH4X(0.01M)∣∣Ag+(1M)∣Ag( s)Ecell =+0.4 V\begin{matrix} & Au(\text{ }s)\left| {QH}_{2},Q \right|{NH}_{4}X(0.01M)||{Ag}^{+}(1M) \mid Ag(\text{ }s) \\ & E_{\text{cell~}} = + 0.4\text{ }V \end{matrix}
    The couple QH2/Q{QH}_{2}/Q represents quinhydrone electrode, the half cell reaction is given below
    [ Given : EAg+/Ago=+0.8 V and 2.303RT F=0.06 V]\left\lbrack \text{~Given :~}E_{{Ag}^{+}/Ag}^{o} = + 0.8\text{ }V\text{~and~}\frac{2.303RT}{\text{ }F} = 0.06\text{ }V \right\rbrack
    The pKb{pK}_{b} value of the ammonium halide salt (NH4X)\left( {NH}_{4}X \right) used here is ____ . (nearest integer)

  5. Question 5

    Equilibrium. Asked once: 23 Jan 2025

    116
    pH of water is 7 at 25∘C25^{\circ}C. If water is heated to 80∘C80^{\circ}C, it's pH will :

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