Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure?

Related Mcqs:

1. Gibbs-Duhem equation_____________________?

   A. States that n1dμ1 + n2dμ2 + ….njdμj = 0, for a system of definite composition at constant
   temperature and pressure
   B. Applies only to binary systems
   C. Finds no application in gas-liquid equilibria involved in distillation
   D. None of these

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 relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the _____________ equation?

   A. Gibbs-Duhem
   B. Van Laar
   C. Gibbs-Helmholtz
   D. Margules

4. 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

5. 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

6. The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the _____________ equation?

   A. Van Laar
   B. Margules
   C. Gibbs-Duhem
   D. Gibbs-Duhem-Margules

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

   A. 0
   B. ∞
   C. + ve
   D. – ve

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

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

9. While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is _______________?

   A. Infinity
   B. Unity
   C. Constant
   D. Negative

10. 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