Physics · Thermodynamics

For an ideal gas, the specific heat relation is CP − CV = R in state P, and CP − CV = 1.10R in state Q, where CP and CV are molar specific heats at constant pressure and volume, respectively. If TP and TQ represent the temperatures in Kelvin for the states P and Q, respectively, then which of the following is true if the gas behaves non-ideally at lower temperatures?