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(A) The Van der Waals equation is given by $\left( P + \frac{n^2a}{V^2} \right)(V - nb) = nRT$.At low pressure,the volume $V$ is very large,making the

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temperature is sufficiently high and pressure is low

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(A) The Van der Waals equation is given by $\left( P + \frac{n^2a}{V^2} \right)(V - nb) = nRT$.At low pressure,the volume $V$ is very large,making the correction term $\frac{n^2a}{V^2}$ negligible compared to $P$.At high temperature,the volume $V$ is also large,making the correction term $nb$ negligible compared to $V$.Under these conditions,the equation simplifies to $PV = nRT$,which is the ideal gas equation.

Van der Waals equation for a gas is stated as,
$p = \frac{nRT}{V - nb} - a\left( \frac{n}{V} \right)^2$
This equation reduces to the perfect gas equation,$p = \frac{nRT}{V}$,when:

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Van der Waals equation for a gas is stated as,$p = \frac{nRT}{V - nb} - a\left( \frac{n}{V} \right)^2$This equation reduces to the perfect gas equation,$p = \frac{nRT}{V}$,when: