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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)` The partial pressure of `PCl_(5)`, if equilibrium is established at new equlibrium pressure 35 atm by changing volume is :

A

10 atm

B

15 atm

C

18 atm

D

12 atm

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The correct Answer is:
B
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