Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Phosphorus pentachloride dissociates as follows in a closed reaction vessel.
PCl 5 (g) 
PCl 3 (g) + Cl 2 (g)
If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl 5 is x, the partial pressure of PCl 3 will be :
A
P
B
P
C
P
D
P
Text Solution
Verified by ExpertsThe correct answer is:
A
Given:
PCI 5 (g) 
PCI 3 (g) + CI 2 (g)
t = 0 1 0 0
t eq 1–x x x
Total number of moles = 1 – x + x + x = 1 + x
Thus partial pressure of PCI 3 = 
P.
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