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For real gases the relation between p, V...

For real gases the relation between p, V and T is given by c=van der Waal's equation
`(p+ (an^(2))/V^(2)) (V-nb)=nRT`
where, 'a' and 'b' are van der Waal's constanrs, 'nb' is approximately equal to the total volume of the molecules of a gas. 'a' is the measure of magnitude of intermolecular attraction.
(i) Arrange the following gases in the increasin order of 'b'. give reason.
`O_(2), CO_(2), H_(2), He`
(ii) Arrange the following gases in the decreasing order of magnitude of 'a'. Give reason.
`CH_(4), O_(2), H_(2)`

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