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Question

The vapour density of PCl5 is 104.25 but when heated to 230oC, its vapour density is reduced to 62.
The decomposition reaction of PCl5 on heating is
PCl5(g)PCl3(g)+Cl2(g)
Calculate the degree of dissociation of PCl5 at this temperature :

A
0.086
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B
0.68
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C
0.068
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D
0.86
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