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Day 392: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 4 Apr 2026 S1

    29
    Given below are two statements: Statement I: For an ideal gas, heat capacity at constant volume is always greater than the heat capacity at constant pressure. Statement II : In a constant volume process, no work is produced, and all the heat withdrawn goes into the chaotic motion and is reflected by a temperature increase of the ideal gas. In the light of the above statements, choose the correct answer from the options given below

    Tap an option to check your answer.

  2. Question 2

    Classification of Elements and Periodicity. Asked once: 6 Apr 2026 S1

    46
    First and second ionization enthalpies of lithium are 520 kJ mol−1520\text{ }kJ{\text{ }mol}^{- 1} and 7297 kJ mol−17297\text{ }kJ{\text{ }mol}^{- 1} respectively. Energy required to convert 3.5 mg lithium (g) into Li2+(g)[Li(g)→Li2+(g)]{Li}^{2 +}(g)\left\lbrack Li(g) \rightarrow {Li}^{2 +}(g) \right\rbrack is ____\_\_\_\_ kJkJ. (nearest integer) [Molar mass of Li=7 g mol−1Li = 7\text{ }g{\text{ }mol}^{- 1} ]

  3. Question 3

    Coordination Compounds. Asked once: 22 Jan 2026 S2

    41
    [Ni(PPh3)2Cl2]\left\lbrack Ni\left( PPh_{3} \right)_{2}Cl_{2} \right\rbrack is a paramagnetic complex. Identify the INCORRECT statements about this complex. (A) The complex exhibits geometrical isomerism. (B) The complex is white in colour. (C) The calculated spin-only magnetic moment of the complex is 2.84 BM . (D) The calculated CFSE (Crystal Field Stabilization Energy) of Ni in this complex is −0.8Δ0- 0.8\Delta_{0}. (E) The geometrical arrangement of ligands in this complex is similar to that in Ni(CO)4Ni(CO)_{4}. Choose the correct answer from the options given below :

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  4. Question 4

    Electrochemistry. Asked once: 28 Jan 2026 S2

    49
    A volume of x mLx\text{ }mL of 5MNaHCO35M{NaHCO}_{3} solution was mixed with 10 mL of 2MH2CO32MH_{2}{CO}_{3} solution to make an electrolytic buffer. If the same buffer was used in the following electrochemical cell to record a cell potential of 235.3 mV , then the value of x=x = ____\_\_\_\_ mL (nearest integer).
    Sn( s)∣Sn(OH)62−(0.5M)∣HSnO2−(0.05M)∣OH−∣Bi2O3( s)∣Bi( s)Sn(\text{ }s)\left| Sn(OH)_{6}^{2 -}(0.5M) \right|{HSnO}_{2}^{-}(0.05M) \mid {OH}^{-}\left| {Bi}_{2}O_{3}(\text{ }s) \right|Bi(\text{ }s)
    Consider up to one place of decimal for intermediate calculations
    [ Given: ESn(OH)62−/HSnO2−∘=−0.9 VEBi2O3,Bi∘=−0.44 VpKa(H2CO3)=6.112.303RT F=0.059 V Anti log⁡(1.29)=19.5]\begin{bmatrix} \text{~Given:~} & E_{Sn(OH)_{6}^{2 -}/{HSnO}_{2}^{-}}^{\circ} = - 0.9\text{ }V \\ & E_{{Bi}_{2}O_{3},Bi}^{\circ} = - 0.44\text{ }V \\ & {pKa}_{\left( H_{2}{CO}_{3} \right)} = 6.11 \\ & \frac{2.303RT}{\text{ }F} = 0.059\text{ }V \\ & \text{~Anti~}\log(1.29) = 19.5 \end{bmatrix}

  5. Question 5

    Equilibrium. Asked once: 22 Jan 2026 S1

    50
    Dissociation of a gas A2A_{2} takes place according to the following chemical reactions. At equilibrium, the total pressure is 1 bar at 300 K.
    A2( g)⇌2 A( g)A_{2}(\text{ }g) \rightleftharpoons 2\text{ }A(\text{ }g)
    The standard Gibbs energy of formation of the involved substances has been provided below:
    SubstanceΔfG∘/kJ mol−1\Delta_{f}G^{\circ}/kJ\ mol^{-1}
    A2A_{2}-100.00
    AA-50.832
    The degree of dissociation of A2(g)A_{2}(g) is given by (x×10−2)1/2\left( x \times 10^{- 2} \right)^{1/2} where x=x = ____\_\_\_\_ . (Nearest integer). [Given : R=8 J mol−1 K−1,log⁡2R = 8\text{ }J{\text{ }mol}^{- 1}{\text{ }K}^{- 1},\log2 = 0.3010, log⁡3=0.48]\log3 = 0.48\rbrack