A. ΔF = ΔH + T [∂(ΔF)/∂T]P
B. ΔF = ΔH – TΔT
C. d(E – TS) T, V < 0
D. dP/dT = ΔHvap/T.ΔVvap
Related Mcqs:
- Gibbs free energy (G) is represented by, G = H – TS, whereas Helmholtz free energy, A. is given by, A = E – TS. Which of the following is the Gibbs-Helmholtz equation ?
A. [∂(G/T)/∂T] = – (H/T2)
B. [∂(A/T)/∂T]V = – E/T2
C. Both A. and B.
D. Neither A. nor B. - The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x1. x2, where A is a constant. The corresponding equation for ln y1, where y1 is the activity co-efficient of component 1, is__________________?
A. A . x22
B. Ax1
C. Ax2
D. Ax12 - Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure?
A. Fugacity
B. Partial pressure
C. Activity co-efficient
D. All (A), (B), and (C) - Helmholtz free energy A. is defined as____________________?
A. A = H – TS
B. A = E – TS
C. A = H + TS
D. None of these - The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is________________?
A. (∂T/∂V)S = – (∂P/∂S)V
B. (∂S/∂P)T = – (∂V/∂T)P
C. (∂V/∂S)P = (∂T/∂P)S
D. (∂S/∂V)T = (∂P/∂T)V - The standard Gibbs free energy change of a reaction depends on the equilibrium______________________?
A. Pressure
B. Temperature
C. Composition
D. All A, B. and C - Gibbs free energy of mixing at constant pressure and temperature is always__________________?
A. 0
B. ∞
C. + ve
D. – ve - Gibbs free energy at constant pressure and temperature under equilibrium conditions is___________________?
A. ∞
B. 0
C. Maximum
D. Minimum - Gibbs free energy of a pure fluid approaches _____________ as the pressure tends to zero at constant temperature?
A. Infinity
B. Minus infinity
C. Zero
D. None of these - Specific/molar Gibbs free energy for a pure substance does not change during________________?
A. Sublimation
B. Vaporisation
C. Melting
D. Either A, B. or C.
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