Addition of a non-volatile solute to a pure solvent ____________________?

Related Mcqs:

1. The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ?

   A. 0.2
   B. 0.1
   C. 0.4
   D. 0.6

2. Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?

   A. Freezing point elevation
   B. Boiling point depression
   C. Vapor pressure lowering
   D. All A., B. & C.

3. The vapour pressure of a solution (made by dissolving a solute in a solvent) is ____________ that of the pure solvent?

   A. Less than
   B. More than
   C. Equal to
   D. Either more or less; depends on the solvent

4. Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult’s law is proportional to the_____________?

   A. Temperature
   B. Volume of solution
   C. Moles of non-volatile solute
   D. None of these

5. A very dilute solution is prepared by dissolving ‘x1’ mole of solute in ‘x2’ mole of a solvent. The mole fraction of solute is approximately equal to_________________?

   A. x1/x2
   B. x2/x1
   C. 1 – (x1/x2)
   D. 1/x2

6. In case of a ternary system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the______________?

   A. Solute concentration
   B. Temperature
   C. Both A. & B.
   D. Neither A. nor B.

7. Number of gm moles of solute dissolved in 1 kg of solvent is called its___________________?

   A. Normality
   B. Molarity
   C. Molality
   D. Formality

8. Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0°C will be _______________ atmosphere?

   A. 0.5
   B. 1
   C. 1.5
   D. 2

9. Which of the following has the smallest least effect on the solubility of a solute into the solvent ?

   A. Nature of the solute
   B. Nature of the solvent
   C. Temperature
   D. Pressure

10. Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?

    A. Temperature
    B. Nature of solute
    C. Pressure
    D. Nature of solvent