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JEE Main levelSingle correct optionDifficulty 2 of 3ce179

$PCl X_{5}$ is placed in a rigid vessel and allowed to dissociate at constant temperature. The pressure at equilibrium is 1.40 times the initial pressure. The degree of dissociation is

A $0.70$
B $0.71$
C $0.40$
D $0.20$

Answer: C

At constant

V

and

T

, pressure is proportional to moles:

P_{e q} / P_{0} = 1 + α = 1.40

, so

α = 0.40

.

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