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Question

A real gas obeying van der Waal equation will resemble ideal gas if the

A
constants a and b are negligibly small
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B
a is large and b is small
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C
a is small and b is large
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D
constants a and b are large
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Solution

The correct option is A constants a and b are negligibly small
According to van der Waal's equation (P+aV2)(Vb)=RT for one mole of the gas. Obviously if a and b are small, aV2 and b can be neglected as compared to P and V and the equation reduces to PV=RT for one mole of gas.
A real gas will resemble an ideal gas when constant a and b are small

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