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MCQs

1. Relative lowering of vapour pressure depends on:
A. Nature of solute
B. Nature of solvent
C. Mole fraction of solute
D. Temperature only

2. Vapour pressure of a solvent decreases when:
A. A volatile solute is added
B. A non-volatile solute is added
C. Temperature increases
D. Pressure decreases

3. The main reason for lowering of vapour pressure is:
A. Increase in solute molecules
B. Decrease in solvent molecules at surface
C. Increase in temperature
D. Increase in pressure

4.Relative lowering of vapour pressure is given by: ΔP/P° = (P° - P) / P° = X_solute
A. (P⁰ - P) / P⁰ = X_solute
B. P = iCRT
C. ΔT_b = K_bm
D. ΔT_f = K_fm

5. Which law explains lowering of vapour pressure?
'’s Law
B. Charle's Law
C. Raoult's Law
D. Dalton's Law

6. If mole fraction of solute increases, vapour pressure will:
A. Increase
B. Decrease
C. Remain constant
D. Become zero

7. Which solution will show maximum lowering of vapour pressure?
A. 1 M glucose
B. 1 M NaCl
C. 1 M CaCl₂
D. 1 M urea

8. Which of the following is TRUE?
A. Vapour pressure depends on solute nature
B. Vapour pressure lowering is a colligative property
C. Vapour pressure increases with solute addition
D. It depends on colour of solution

9. If a solute associates in solution, the lowering of vapour pressure will be:
A. Higher than expected
B. Lower than expected
C. Same as expected
D. Zero

10. For an ideal solution, relative lowering of vapour pressure is equal to:
A. Mole fraction of solvent
B. Mole fraction of solute
C. Molarity
D. Molality