For real gases the relation between p, V and T is given by van der Waals equation : where ‘a’ and ‘b’ are van der Waals constants, ‘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 increasing order of ‘b’. Give reason. , , , He. (ii) Arrange the following gases in the decreasing order of magnitude of ‘a’. Give reason. , , .

For real gases the relation between p, V and T is given by van der Waa

1.	For real gases the relation between p, V and T is given by van der Waals equation : where ‘a’ and ‘b’ are van der Waals constants, ‘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 increasing order of ‘b’. Give reason. , , , He. (ii) Arrange the following gases in the decreasing order of magnitude of ‘a’. Give reason. , , .
Answer» an CO2 than H22- CH4 than O2 than H2