In the system, LaCl₃(s) + H₂O(g) + heat ⇌ LaClO(s) + 2HCl(g), equilibrium is established. More water vapour is added to disturb the equilibrium. If the pressure of water vapour at new equilibrium is d

Question

In the system, LaCl₃(s) + H₂O(g) + heat ⇌ LaClO(s) + 2HCl(g), equilibrium is established. More water vapour is added to disturb the equilibrium. If the pressure of water vapour at new equilibrium is double of that at initial equilibrium, the factor by which pressure of HCl is changed is

Prashant Kotian · Accepted Answer

Correct answer: B. K_p = P_HCl² / P_H₂O. Let initial pressures be P_HCl and P_H₂O. New equilibrium has P_H₂O' = 2 P_H₂O. Since K_p remains constant, (P_HCl')² / (2 P_H₂O) = K_p = P_HCl² / P_H₂O. This gives (P_HCl')² = 2 P_HCl², meaning P_HCl' = √2 P_HCl. Therefore, correct answer is B.

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