For the equilibrium,

$C a C O_{3} (s) ⇌ C a O (s) + C O_{2} (g)$ ,

Which of the following expressions is correct?

K_{p} = \frac{[C a O] [C O_{2}]}{[C a C O_{3}]}

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K_{p} = \frac{(P_{C a O} \times P_{C O_{2}})}{(P_{C a C O_{3})}}

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K_{p} = P_{C O_{2}}

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K_{p} = \frac{P_{C a O} + P_{C O_{2}}}{P_{C a C O_{3}}}

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Solution

The correct option is A $K_{p} = P_{C O_{2}}$
For the thermal decomposition of Calcium Carbonate
the equilibrium constant $K_{P}$ is defined as
$K_{p} = P_{C O_{2}}$
Because of the only contribution in pressure by $C O_{2} (g)$
Here the forward reaction is endothermic.

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1073

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