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At 200^(@) C PCl(5) dissociates as follo...

At `200^(@) C PCl_(5)` dissociates as follow , `PCl_(s(g)) hArr PCl_(3(g)) + Cl_(2(g)) `. It was found that the equilibrium vapour. are 62 times as heavy as hydrogen. The degree of dissociation of `PCl_(5)` at `200^(@)` C is nearly.

A

0.1

B

0.42

C

0.5

D

0.68

Text Solution

Verified by Experts

The correct Answer is:
D
`alpha=(M-m)/(m(n-1))`
`m=2 xx 62=124 implies alpha=(208.5 -124)/(124)=0.68`
`1-alpha=68%`
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