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Question

The thermal dissociation equilibrium of CaCO3(s) is studied under different conditions
CaCO3(s)CaO(s)+CO2(g)
For this equilibrium, the correct statement(s) is/are :

A
ΔH is dependent on T
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B
K is independent of the initial amount of CaCO3
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C
K is dependent on the pressure of CO2, at a given T
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D
ΔH is independent of catalyst, if any
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Solution

The correct option is D ΔH is independent of catalyst, if any
(A) ΔH=Cp(rxn)ΔT
Hence, enthalpy depends upon temperature

(B) CaCO3(s)CaO(s)+CO2(g) Kp=PCO2

(C) Keq, depends only on temperature and not on Pressure.

(D) Enthalpy of reaction is independent of the catalyst. Catalyst generaly changes activation energy.

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