Question

When an impurity is added to a liquid, the boiling point of the liquid

• A. remains unchanged
• B. rises
• C. falls
• D. may rise or fall

Answer 1

The correct option is B

rises

1. The boiling point of a solution is raised by impurities. Because contaminants reduce the number of water molecules available for vaporization during boiling.
2. The amount of heat required to evaporate the same amount of impure solution is more than the amount of heat necessary to vaporize a pure solution.

Hence, option B is correct.