Which of the below combinations are peculiarities of the boiling point of a liquid?

I. A liquid boils when its saturated vapor pressure is equal to the external pressure
II. Dissolved substances in pure water lead to an increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decreases the boiling point

A. I, II and III only
B. I, II, III, and IV
C. I, II, and IV
D. II, III, and IV

Correct Answer:

Option A = I, II and III only

Explanation

The boiling point of a liquid depends on temperature, atmospheric pressure, and the vapor pressure of the liquid.
When the atmospheric pressure is equal to the vapor pressure of the liquid, boiling will begin