In a binary liquid solution of components „A‟ and „B‟, if component „A‟ exhibits positive deviation from Raoult’s law, then component „B‟ ?

Related Mcqs:

1. According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?

   A. No component is concentrated at the surface of the solution
   B. The component molecules are non polar and are of almost equal size
   C. In the formation of solution, chemical combination/molecular association between unlike
   molecules takes place
   D. The attractive forces between like and unlike molecules are almost equal

2. Raoult’s law states that ‘the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component’. This generalisation is based on the assumption that the________________?

   A. Sizes of the component molecules are approximately equal
   B. Attractive forces between like and unlike molecules are approximately equal
   C. Component molecules are non-polar and no chemical combination or molecular association
   between unlike molecules takes place in the formation of the solution
   D. All A., B. & C.

3. “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?

   A. Raoult’s
   B. Henry’s
   C. Amagat’s
   D. None of these

4. 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

5. In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is__________________?

   A. Independent of temperature
   B. Increases with rise in pressure
   C. Increased with decrease in pressure
   D. Unchanged with pressure changes

6. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is__________________?

   A. Independent of the temperature
   B. Increased with the increase in pressure
   C. Decreased with the increase in pressure
   D. Unchanged by the pressure change

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

   A. Measures the elevation in boiling point
   B. Is not dependent on the temperature
   C. Is a function of the liquid phase composition
   D. Measures the depression in freezing point

8. 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.

9. In a binary liquid system, the composition expressed as _______________ is independent of the temperature & pressure?

   A. Kg of solute/kg of solvent
   B. Kg-mole of solute/kg-mole of solvent
   C. Kg-mole of solute/1000 kg of solvent
   D. All A., B. & C.

10. In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality ?

    A. Use of equation of state
    B. Fugacity co-efficient
    C. Activity co-efficient
    D. None of these