Questions  

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
xx+1P
b
2x1xP
c
xx1P
d
x1xP

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detailed solution

Correct option is A

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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