SOLUTION WORKSHEET 1

 Here are 20 multiple-choice questions (MCQs) for Class 12 Chapter on "Solutions" for board exam practice:

1. Which of the following is a colligative property? a) Vapour pressure
   b) Boiling point elevation
   c) Freezing point depression
   d) Both b and c

2. In an ideal solution, the enthalpy of mixing of the pure components is: a) Positive
   b) Negative
   c) Zero
   d) Cannot be determined

3. Raoult's law is applicable to: a) Ideal solutions only
   b) Non-ideal solutions
   c) Colloidal solutions
   d) Supersaturated solutions

4. The solubility of gases in liquids is increased by: a) Decreasing temperature and increasing pressure
   b) Increasing temperature and decreasing pressure
   c) Increasing temperature and pressure
   d) Decreasing both temperature and pressure

5. Which of the following is not a colligative property? a) Osmotic pressure
   b) Vapour pressure lowering
   c) Elevation of boiling point
   d) Electrical conductivity

6. Which of the following is true for an ideal solution? a) ΔH = 0, ΔV = 0
   b) ΔH > 0, ΔV > 0
   c) ΔH < 0, ΔV < 0
   d) ΔH = 0, ΔV > 0

7. The van’t Hoff factor for a dilute aqueous solution of NaCl is: a) 1
   b) 2
   c) 1.5
   d) 0

8. Which solution will have the highest boiling point? a) 1M urea
   b) 1M glucose
   c) 1M NaCl
   d) 1M KCl

9. The molality of a solution is defined as: a) Moles of solute per liter of solution
   b) Moles of solute per kilogram of solvent
   c) Moles of solvent per kilogram of solute
   d) Moles of solute per mole of solvent

10. In the context of colligative properties, which of the following does not depend on the nature of the solute? a) Boiling point elevation
    b) Freezing point depression
    c) Osmotic pressure
    d) Nature of the solute

11. The freezing point of a solution is lowered due to: a) Lowering of vapour pressure
    b) Decrease in molecular weight
    c) Increase in molecular interaction
    d) Increase in the molar mass of the solvent

12. Which of the following correctly expresses Raoult's law? a) P₁ = X₁ P₁°
    b) P₂ = X₂ P₂°
    c) Both a and b
    d) None of the above

13. For an ideal solution, the total vapour pressure varies linearly with: a) Molar mass
    b) Mole fraction of each component
    c) Density
    d) Temperature

14. The osmotic pressure of a solution depends on: a) Volume of solution
    b) Number of solute particles
    c) Type of solute
    d) Temperature only

15. Which of the following compounds will show a positive deviation from Raoult's law? a) Benzene and toluene
    b) Acetone and chloroform
    c) Ethanol and water
    d) n-Hexane and n-Heptane

16. The elevation of boiling point is directly proportional to: a) Molarity
    b) Molality
    c) Mole fraction
    d) Normality

17. Which of the following statements about osmotic pressure is correct? a) It decreases with an increase in temperature
    b) It is a colligative property
    c) It depends on the volume of solution
    d) It is independent of the number of solute particles

18. For a non-volatile solute dissolved in a volatile solvent, the vapour pressure of the solvent: a) Increases
    b) Decreases
    c) Remains the same
    d) None of the above

19. Which of the following is not an example of an ideal solution? a) Benzene and toluene
    b) n-Hexane and n-Heptane
    c) Acetone and chloroform
    d) Ethanol and methanol

20. Which factor does not affect the colligative properties of a solution? a) Nature of the solvent
    b) Nature of the solute
    c) Number of solute particles
    d) Temperature

These questions cover key concepts from the chapter on "Solutions" for Class 12 board exam practice