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Question

To the equilibrium system PCl5(g)PCl3(g)+Cl2(g), gaseous Cl2 is added, increasing the volume at the same time in such a manner so that PCl3 in the system remains unchanged temperature remains constant what happens to the equilibrium ?

A
Shifted backward
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B
Remains unaffected
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C
Shifted forward
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D
Depends on the magnitude of PCl3
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Solution

The correct option is B Remains unaffected
Adding Cl2 shifts the equilibrium backwards, but increasing the volume decreases the pressure thus equilibrium shift in forward direction, thus the effect is canceled mutually, thus PCl3 remains unchanged.

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