PV = nRT is derived by kinetic theory and valid only for ideal gas. Real gas deviate from ideal gas behaviour and follow this behaviour at low pressure and high temperature. To explain the deviation of Real gas from ideal gas behaviour, a term compressibility factor Z is used.
Z = 
For ideal gas Z = 1 and for real gas Z = 1 or Z < 1 the graph between Z and P is shown as –
(i)The correct order of 'a' of the gases shown in given graph –
Text Solution
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Ans.
(i)
Sol. NH 3 > CH 4 > N 2 > He > H 2
(ii)
Sol. molecular interaction between the atoms and 
(iii)
Sol. In He Z > 1 so repulsive forces are dominating so molar volume is greater than 22.4 L
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