A. 0
B. ∞
C. + ve
D. – ve
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. - 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 - 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 - Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?
A. Decreases
B. Increases
C. Remains constant
D. Decreases logarithmically - 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) - Gibbs free energy (F) is defined as__________________?
A. F = E – TS
B. F = H – TS
C. F = H + TS
D. F = E + TS - Gibbs free energy per mole for a pure substance is equal to the__________________?
A. Latent heat of vaporisation
B. Chemical potential
C. Molal boiling point
D. Heat capacity - The change in Gibbs free energy for vaporisation of a pure substance is___________________?
A. Positive
B. Negative
C. Zero
D. May be positive or negative - 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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