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Le - Chatelier principle is not applicab...

Le - Chatelier principle is not applicable to :

A

`H_(2)(g)+I_(2)(g)hArr2HI(g)`

B

`Fe(s)+S(s)hArrFeS(s)`

C

`N_(2)(g)+3H_(2)(g)hArrNH_(3)(g)`

D

`N_(2)(g)+O_(2)(g)hArr2NO(g)`

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The correct Answer is:
To determine where Le Chatelier's principle is not applicable, we need to analyze the given reactions and identify the conditions under which the principle operates. Le Chatelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change. ### Step-by-Step Solution: 1. **Understanding Le Chatelier's Principle**: - Le Chatelier's principle applies to systems in equilibrium. It indicates how the equilibrium position shifts in response to changes in concentration, pressure, or temperature. 2. **Identifying the Types of Reactions**: - We need to evaluate the reactions provided in the question to see which ones involve pure solids and which involve gases or solutions. 3. **Analyzing Each Reaction**: - **Reaction A**: \( H_2(g) + I_2(g) \rightleftharpoons 2 HI(g) \) - This is a gaseous reaction. Changes in concentration or pressure will affect the equilibrium. Thus, Le Chatelier's principle is applicable here. - **Reaction B**: \( Fe(s) + S(s) \rightleftharpoons FeS(s) \) - This is a solid-solid reaction. Adding or removing solids does not change the concentration of solids in equilibrium. Therefore, Le Chatelier's principle is not applicable to this reaction. - **Reaction C**: \( N_2(g) + 3H_2(g) \rightleftharpoons 2 NH_3(g) \) - This is also a gaseous reaction. Changes in concentration or pressure will affect the equilibrium, so Le Chatelier's principle is applicable. - **Reaction D**: (Assuming a gaseous reaction similar to A and C) - If this is a gaseous reaction, then Le Chatelier's principle would also be applicable here. 4. **Conclusion**: - From the analysis, we find that Le Chatelier's principle is not applicable to the solid-solid equilibrium represented by Reaction B: \( Fe(s) + S(s) \rightleftharpoons FeS(s) \). ### Final Answer: Le Chatelier's principle is not applicable to the reaction \( Fe(s) + S(s) \rightleftharpoons FeS(s) \) (Option B). ---
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