Question

Choose the correct option concerning about the definition of the normal boiling point of a liquid?

• A. the temperature at which the liquid boils
• B. the pressure at which the liquid boils at ${100}^{\circ }C$
• C. the temperature at which the liquid vapour pressure is 1 atm
• D. ${100}^{\circ }C$
• E. dependent upon the pressure above the liquid

Answer 1

The correct option is C the temperature at which the liquid vapour pressure is 1 atm

When the vapour pressure of the liquid becomes equal to the atmospheric pressure, the liquid boils.

The temperature at which the liquid boils is the boiling point of the liquid.

When the atmospheric pressure is 1 atm, the boiling point is the normal boiling point.

Hence the correct option is C.