Gibbs-Duhem equation_____________________?

Related Mcqs:

1. 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)

2. 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.

3. 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

4. Gibbs free energy (F) is defined as__________________?

   A. F = E – TS
   B. F = H – TS
   C. F = H + TS
   D. F = E + TS

5. 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

6. Gibbs phase rule finds application, when heat transfer occurs by___________________?

   A. Conduction
   B. Convection
   C. Radiation
   D. Condensation

7. Gibbs-Helmholtz equation is__________________?

   A. ΔF = ΔH + T [∂(ΔF)/∂T]P
   B. ΔF = ΔH – TΔT
   C. d(E – TS) T, V < 0
   D. dP/dT = ΔHvap/T.ΔVvap

8. Gibbs free energy at constant pressure and temperature under equilibrium conditions is___________________?

   A. ∞
   B. 0
   C. Maximum
   D. Minimum

9. Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as________________?

   A. P + F – C = 2
   B. C = P – F + 2
   C. F = C – P – 2
   D. P = F – C – 2

10. 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.