Gibbs free energy of mixing at constant pressure and temperature is always__________________?
		A. 0
B. ∞
C. + ve
D. – ve
		A. 0
B. ∞
C. + ve
D. – ve
		A. Equation of state
B. Gibbs Duhem equation
C. Ideal gas equation
D. None of these
		A. Independent of pressure
B. Independent of temperature
C. Zero at absolute zero temperature for a perfect crystalline substance
D. All A, B. & C
		A. Indeterminate
B. Zero
C. Negative
D. None of these
		A. Amount of energy transferred
B. Direction of energy transfer
C. Irreversible processes only
D. Non-cyclic processes only
		A. A gas may have more than one inversion temperatures
B. The inversion temperature is different for different gases
C. The inversion temperature is same for all gases
D. The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
		A. Pressure
B. Temperature
C. Volume
D. Molar concentration