Two systems PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) and COCl₂(g) ⇌ CO(g) + Cl₂(g) are simultaneously in equilibrium in a vessel at constant volume. If some CO is introduced into the vessel, then at the new equilib

Question

Two systems PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) and COCl₂(g) ⇌ CO(g) + Cl₂(g) are simultaneously in equilibrium in a vessel at constant volume. If some CO is introduced into the vessel, then at the new equilibrium, the moles of

Prashant Kotian · Accepted Answer

Correct answer: C. Adding CO shifts the second equilibrium (COCl₂ ⇌ CO + Cl₂) backward, consuming Cl₂. The decrease in Cl₂ concentration causes the first equilibrium (PCl₅ ⇌ PCl₃ + Cl₂) to shift forward according to Le Chatelier's principle. This forward shift decreases the moles of PCl₅. Therefore, correct answer is C.

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