JEE Advanced 2013 · Paper 2 · Chemistry Q24

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ChemistryMultiple correct+3 / -1Question 24 of 60

The thermal dissociation equilibrium of $\ce{CaCO3}(s)$ is studied under different conditions.
$\ce{CaCO3(s) <=> CaO(s) + CO2(g)}$
For this equilibrium, the correct statement(s) is(are)

\Delta H

is dependent on

T

K

is independent of the initial amount of

\ce{CaCO3}

K

is dependent on the pressure of

\ce{CO2}

at a given

T

\Delta H

is independent of the catalyst, if any

Answer and worked solution

Official answer: A, B, D

(A) ΔH varies with temperature (Kirchhoff's law, $\Delta C_p\ne0$ ). True.
(B) $K=p_{\ce{CO2}}$ involves no solid, so it does not depend on how much CaCO₃ is present. True.
(C) $K$ depends only on temperature; the CO₂ pressure adjusts to it. False.
(D) A catalyst does not change ΔH. True.

(A), (B), (D)

Topics:Law of mass action and Kc, Kp First law and enthalpy

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JEE Advanced 2013 · Paper 2, Chemistry question 24