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Q.

Phosphorus pentachloride dissociates as follows in a closed reaction vessel.

PCl5(g)PCl3(g)+Cl2(g)

If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl5 is x. the partial pressure of PCl3 will be :

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a

x1xP

b

2x1xP

c

xx+1P

d

xx1P

answer is A.

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Detailed Solution

For the standard reaction,

aA+bBcC+dDKp=PCcPDdPAaPBb

Let the degree of dissociation for PCl5 is x.

PCl51xPCl3x(g) +Cl2(g)x

Therefore,

PCl3=x1+x×P

Hence, option A is correct.

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