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a'mol of PCl(5),undergoes,thermal dissoc...

a'mol of `PCl_(5)`,undergoes,thermal dissociation as: `PCl_(5)` `rightleftharpoons` `PCl_(3)+Cl_(2)`,the mole fraction of `PCl_(3)` at equilibrium is "0.25" and the total pressure is "2.0atm".The partial pressure of `Cl_(2)` at equilibrium is :-
(1) 2.5
(2) 1.0
(3) 0.5
(4) None

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