In comparison to pure water, Boiling point of impure water

Question

Question

This question was previously asked in

JKSSB JE Civil Jal Shakti 5 Dec 2022 Official Paper (Shift 2)

Answer 1

Explanation:

Boiling point of a solution is generally defined as the the temperature at which the vapor pressure of a liquid is equal to the pressure of the gas above it.
Adding impurities to a solution, in most cases, increases the boiling point of the solution.
This occurs because the presence of impurities decreases the number of water molecules available to become vaporized during boiling. Once this occurs, it takes a greater amount of heat to cause the same amount of impure solution to vaporize as it would take to cause a pure solution to vaporize, thus raising the solution's overall boiling point.