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    CBSE

    Subject

    Chemistry
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    NEET Chemistry : Thermodynamics

    Multiple Choice Questions

    71.

    For the reaction :

    N2 + 3H2 ⇌ 2NH3 ; ∆H = ?

    • ∆E + 2RT

    • ∆E - 2RT

    • ∆E + RT

    • ∆E - RT

    Answer
    • 72.

    Which thermodynamic parameter is not a state function?

    • q at constant pressure

    • q at constant volume

    • W at adiabatic

    • W at isothermal

    Answer
    • 73.

    Assertion: For an isolated system, q is zero.

    Reason : In an isolated system, change in U and V is zero.

    • If both assertion and reason are true and reason is the correct explanation of assertion.

    • If both assertion and reason are true but reason is not the correct explanation of assertion.

    • If assertion is true but reason is false.

    • If both assertion and reason are false.

    Answer
    • 74.

    The enthalpy of formation of CO(g), CO2(g), N2O(g), and N2O4(g) is -110, -393, +811 and 10 kJ/mol respectively. For the reaction, N2O4 + 3CO(g) → N2O(g)+ 3CO2(g); ∆Hr (kJ/mol) is

    • -212

    • +212

    • +48

    • -48

    Answer
    • 75.

    Assertion : Catalyst changes Gibbs free energy of system.

    Reason : Catalyst changes pre-exponential factor of a chemical reaction.

    • If both assertion and reason are true and reason is the correct explanation of assertion.

    • If both assertion and reason are true but reason is not the correct explanation of assertion.

    • If assertion is true but reason is false.

    • If both assertion and reason are false.

    Answer
    • 76.

    For endothermic reaction :

    • Ea > Ea'

    • Ea = Ea'

    • Ea < Ea'

    • None of these

    Answer
    • 77.

    Assertion : A process is called adiabatic if the system does not exchange heat with the surroundings.

    Reason : It does not not involve increase or decrease in temperature of the system.

    • If both assertion and reason are true and reason is the correct explanation of assertion

    • If both assertion and reason are true but reason is not the correct explanation of assertion.

    • If assertion is true but reason is false.

    • If both assertion and reason are false.

    Answer
    • 78.

    The difference between heat of reaction at constant pressure and constant volume of the reaction :

    2C6H6 (l) + 15O2 (g) → 12CO2 + 6H2O (l)

    at 25°C (in kJ) is :

    • - 7.43

    • 3.72

    • - 3.72

    • 7.43

    Answer
    • 79.

    Heat of combustion of C and CO are -394 and -285 kJ respectively , so heat of formation of CO in kJ/mol is :

    • - 218

    • - 109

    • + 109

    • + 218

    Answer
    • 80.

    Assertion : Entropy of system increases for a spontaneous reaction.

    Reason : Enthalpy of reaction always decreases for spontaneous reaction.

    • If both assertion and reason are true and reason is the correct explanation of assertion.

    • If both assertion and reason are true but reason is not the correct explanation of assertion.

    • If assertion is true but reason is false.

    • If both assertion and reason are false.

    Answer
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