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For the dissociation of PCl(5) into PCl(...

For the dissociation of `PCl_(5)` into `PCl_(3)` and `Cl_(2)` in gaseous phase reaction , if d is the observed vapour density and D the theoretical vapour density with `'alpha'` as degree of dissociation ,variaton of D/d with `'alpha'` is given by ?

A

B

C

D

none of these

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The correct Answer is:
a
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