When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : The figure shows the effect of pressure on the compressibility factor, Z of a gas :

When a sample of ideal gas is changed from an initial state to a final

1.	When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : The figure shows the effect of pressure on the compressibility factor, Z of a gas :
Answer» The curve AE can be explained by PV=RT The curve AF and CD can be explained by PV=RT+Pb The curve AB can be explained by PV=RT-`a/V` All the THREE curves AF,AE and AD shows the real behaviour Solution :(A)For AE, Z = constant `implies PV=RT` (B)At higher pressure PV=RT+Pb ( C)At LOWER pressure `PV=RT-a/V`