$K_{c}$ for the reaction of decomposition of $C a C O_{3}$ can be written as ________.

[C O_{2}]

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[C O_{3}]

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[C a O] [C O_{2}]

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None of these

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Solution

The correct option is C $[C O_{2}]$
$C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
In the case of equilibrium constant we write the products side divided by reactants side which are gaseous or in the solution state. In the above reaction, only carbon dioxide is a gas. The other two are in solid-state whose concentration is taken as unity.

Hence, $K_{c} = [C O_{2}]$ .

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