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A real gas obeying van der Waal equation will resemble ideal gas if theA. constants a and b both are smallB. a is large and b is smallC. a is small and b is largerD. constants a and b both are large .

Answer» Correct Answer - A
According to van der Waals equation for 1 mole of a real gas
`(P+(a)/(V^(2)))(V-b)=RT`
If a and b are small, `a//V^(2)` and b can neglected as compared to P and V and the equation reduces to PV = RT. Hence, a real gas will resemble an ideal gas when constants a and b are small.


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