Gibbs free energy (F) is defined as__________________?

Related Mcqs:

1. 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.

2. 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

3. 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

4. Gibbs free energy of mixing at constant pressure and temperature is always__________________?

   A. 0
   B. ∞
   C. + ve
   D. – ve

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

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

7. 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

8. 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

9. 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.

10. Helmholtz free energy A. is defined as____________________?

    A. A = H – TS
    B. A = E – TS
    C. A = H + TS
    D. None of these