AIIMS 2018 Chemistry Critical State MCQ Question

At critical state, the compressibility factor (Z) for a real gas is equal to 1, indicating that the gas behaves ideally under these conditions. This is because, at the critical point, the intermolecular forces balance out, leading to a state where the gas's behavior aligns closely with that of an ideal gas, where Z = PV/RT = 1. Other options are incorrect as Z values of 0, 0.5, or 2 do not represent the ideal behavior expected at the critical state; Z values less than 1 indicate attractive forces dominate, while values greater than 1 suggest repulsive forces are significant.