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Van der waal's equation for a gas is stated as , $\;p=\large\frac{nRT}{V-nb}- a(\large\frac{n}{v})^{2}\;$ .This equation reduces to the perfect gas equation $\;p=\large\frac{nRT}{V}\;$ when ,

(a) Temperature is sufficiently high and pressure is low .(b) Temperature is sufficiently low and pressure is high .(c) Both temperature and pressure are very high.(d) Both temperature and pressure are very low.