Q 1117091880.     At temperature `T` (K), `PCl_5` is 50% dissociated at an equilibrium pressure of `4` atm. At what pressure it would dissociate to the extent of `80%` at the same temperature?

A

`0.15` atm

B

`0.50`atm

C

`0.30 `atm

D

`0.75` atm

HINT

Use `K_p = (α^2P)/(1−α^2)`

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