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Q.

For the decomposition of PCl5(g) in to PCl3(g) and Cl2(g) degree of dissociation (α) to attain equilibrium is ___? (consider degree of dissociation is very much less than unity)

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a

Proportional to the equilibrium pressure

b

Proportional to square root of equilibrium pressure

c

inversely proportional to square root of equilibrium pressure

d

Inversely proportional to square of the equilibrium pressure

answer is C.

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Detailed Solution

PCl5(g)⇌PCl3(s)+Cl2(g) Initially 1 mole 00 At equilibrium 1-αααEquilibrium pressure = P atmKP=PPCl3PCl2PPCl5=α1+α·Pα1+α·P1-α1+α·P=α2·P1-α2=α2·P  (∵α<<1)∴α=KPP
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