The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?

Related Mcqs:

1. At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is__________________?

   A. 1.572
   B. 1.9398
   C. 3.389
   D. 4.238

2. For an ideal solution, the value of activity co-efficient is______________________?

   A. 0
   B. 1
   C. 1

3. 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

4. A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?

   A. Temperature only
   B. Temperature and pressure only
   C. Temperature, pressure and liquid composition xi only
   D. Temperature, pressure, liquid composition xi and vapour composition yi

5. 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?

   A. 0.00
   B. 0.18
   C. 0.24
   D. 1.00

6. Which of the following holds good for a solution obeying Raoult’s law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing) ?

   A. ΔH = 1 (+ ve) and Δ V = -ve
   B. ΔH = 0
   C. ΔV = 0
   D. Both B. and C.

7. The chemical potential of any constituent of an ideal solution depends on the ______________ of the solution?

   A. Temperature
   B. Pressure
   C. Composition
   D. All (A), B. and (C)

8. In a homogeneous solution, the activity co-efficient of a component depends upon the_________________?

   A. Pressure
   B. Composition
   C. Temperature
   D. All (A), B. and (C)

9. In an ideal solution, the activity of a component equals its __________________?

   A. Mole fraction
   B. Fugacity at the same temperature and pressure
   C. Partial pressure
   D. None of these

10. 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