At 200OC PCl5. dissociates as follows :PCl5(g)⇌PCl3(g)+Cl2(g) It was found that the equilibrium vapors are 62 times as heavy as hydrogen. The % degree of dissociation of PCl5 at 200oC is nearly :

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10%

42%

50%

68%

answer is D.

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Detailed Solution

GivenMMix=62·MH2 = 124 For PCl5⇌PCl3+Cl2 α=(M)PCl5-(M)Mix(2-1)·(M)Mix=208.5-124124=0.6814degree of dissociation=68.14%

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