Le Chatelier's principle is not applicable to

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(B) Le Chatelier's principle is used to predict the effect of a change in conditions (like concentration,pressure,or temperature) on a system at equil

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$Fe_{(s)} + S_{(s)} \rightleftharpoons FeS_{(s)}$

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(B) Le Chatelier's principle is used to predict the effect of a change in conditions (like concentration,pressure,or temperature) on a system at equilibrium.It is not applicable to reactions involving only pure solids or pure liquids because their active masses are considered constant (unity,$1$) and do not change with the volume of the container.In the reaction $Fe_{(s)} + S_{(s)} \rightleftharpoons FeS_{(s)}$,all reactants and products are in the solid state. Since the activities of pure solids are constant,changing the amount of these solids does not shift the equilibrium position.Therefore,Le Chatelier's principle is not applicable to this system.

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