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The values of critical pressure (Pc) and...

The values of critical pressure (Pc) and critical temperature (Tc) for `O_2, Cl_2, H_2` and He are given below. The gas which has smallest value of Vander Waal's constant b'is

A

`O_2`

B

`Cl_2`

C

`H_2`

D

He

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The correct Answer is:
D
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