Le Chatelier's principle is not applicable to:

F e (s) + S (s) ⇌ F e S (s)

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H_{2} (g) + I_{2} (g) ⇌ 2 H I (g)

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N_{2} (g) + 3 H_{2} (g) ⇌ 2 {N H}_{3} (g)

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N_{2} (g) + O_{2} (g) ⇌ 2 N O (g)

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Solution

The correct option is C $F e (s) + S (s) ⇌ F e S (s)$
Le Chatelier's principle is not applicable to $F e (s) + S (s) ⇌ F e S (s)$ as all the reactants and products are solids. Their concentration (in equilibrium constant expression) is assumed to be unity and can not be changed.

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