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10 moles of pure PCl(5) gas is put into ...

10 moles of pure `PCl_(5)` gas is put into a closed container of volume '`V`' and temerature 'T' and allowed to reach equilibrium, at an equilibrium pressure 20 atm. The pure `PCl_(5)` is found to be `50%` dissociated at equilibrium.
`PCl_(5)(g)hArrPCl_(3)(g)+Cl_(2)(g)` If 20 moles of `PCl_(5)(g)` is added to original equilibrium mixture keeping total pressure constant to 20 atm at same tempereture 'T', then ratio of new equilibriujm volume to the initial volume V will be :

A

1.5

B

`2.0`

C

1.8

D

`3.0`

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The correct Answer is:
D
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