The thermal dissociation equilibrium of CaCO_3(s) is studied under different conditions. CaCO_3(s) CaO(s) + CO_2(g) For this equilibrium, the correct statement(s) is(are)

JEE Advanced 2013 Chemistry question

The thermal dissociation equilibrium of is studied under different conditions.

\mathrm{ \rightleftharpoons CaO(s) + }

For this equilibrium, the correct statement(s) is(are)

(A)ΔH is dependent on TCorrect
(B)K is independent of the initial amount of Correct
(C)K is dependent on the pressure of at a given T
(D)ΔH is independent of the catalyst, if anyCorrect

Answer: (A),(B),(D)

Solution

(A) ΔH changes with temperature according to Kirchhoff's equation, since of the reaction is not zero: true. (B) Solids have constant activity, so at equilibrium, independent of how much is taken: true. (C) K is a constant at a given temperature;

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Question ID VK-026207