Question

The freezing point of $1\%$ solution of lead nitrate in water will be:

• A. $ 2^{\circ} C $
• B. $ 1^{\circ} C $
• C. $ 0^{\circ} C $
• D. below $ 0^{\circ} C $

Answer 1

Answer: (D)

Aqueous solution of any substance (non-volatile) freezes below $0^{\circ} C$ because the vapour pressure of the solution becomes lower than that of pure solvent.