Which of the following reaction shows heterogeneous equilibrium?

N_{2} (g) + 3 H_{2} (g) ⇋ 2 N H_{3} (g)

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C a C O_{3} (s) ⇋ C a O (s) + C O_{2} (g)

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C H_{3} C O O H (l) + C_{2} H_{5} O H (l) ⇋ C H_{3} C O O C_{2} H_{5} (l) + H_{2} O (l)

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N_{2} (g) + O_{2} (g) ⇋ 2 N O (g)

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Solution

The correct option is B $C a C O_{3} (s) ⇋ C a O (s) + C O_{2} (g)$
Heterogeneous equlibrium are those in which reactants and products are in different phase.
In all other reactions, reactants and products are present in same phase. But in $C a C O_{3} (s) ⇋ C a O (s) + C O_{2} (g)$ , $C O_{2}$ is present in vapour phase whereas $C a C O_{3}$ and $C a O$ are present in solid phase.
So it shows heterogeneous equilibrium.

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