At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?

A. (∂E/∂ni)S, v, nj
B. (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj
C. (∂H/∂ni)S, P, nj
D. All (A), B. and (C)

A. Volume
B. Mass
C. Critical temperature
D. None of these

A. RT ln K
B. -RT ln K
C. -R ln K
D. T ln K

A. Shift the equilibrium towards right
B. Give higher yield of NH3
C. Both B. and C
D. Neither A. nor B

A. By throttling
B. By expansion in an engine
C. At constant pressure
D. None of these