Question

Which of the following is true regarding boiling point of a liquid?
A) A liquid boils when its vapor pressure becomes equals to atmospheric pressure
B) A liquid stops boiling when its vapor pressure becomes equals to atmospheric pressure
C) There is no relationship between boiling of liquid, vapor pressure of liquid and atmospheric pressure.
D) A liquid will boil even if its pressure is less than atmospheric pressure.
E) Even if we change the atmospheric pressure, we cannot change the boiling point of liquid

Answer 1

Hint: We must have to know that the boiling point of liquid, vapor pressure of liquid and atmospheric pressure are three correlated with each other. It depends on the temperature conditions.

Complete answer:
We must look for all the options given one by one to answer this question.
Option A) this is a correct option as this statement is true about boiling of liquid. A liquid boils when its vapor pressure becomes equal to atmospheric pressure. And the temperature at which vapor pressure of liquid becomes equal to atmospheric pressure is known as boiling point. A liquid may become gas on boiling. As when boiling a liquid state changes, it turns from liquid to vapor phase.
Option B) This is an incorrect option as at a temperature when vapor pressure of liquid becomes equal to atmospheric pressure is the temperature known as boiling point but this statement is vice versa of what said above thus this is an incorrect option.
Option C) This option is incorrect as there is a relationship between boiling of liquid, vapor pressure of liquid and atmospheric pressure.
Option D) this is an incorrect option.
Option E) this is an incorrect option.

Note:
We have to remember that the temperature at which vapor pressure of liquid becomes equal to atmospheric pressure is known as boiling point. A liquid may become gas on boiling. As when boiling a liquid state changes, it turns from liquid to vapor phase. The difference in the boiling points of different substances will depend upon the vapor pressure of those substances.