Question

During boiling or vaporization, __

• A. all molecules take part.
• B. temperature rises.
• C. no heat is absorbed.
• D. the average kinetic energy of molecules increases.

Answer 1

The correct option is A

all molecules take part.

The boiling is not just a surface phenomenon. Only when all the molecules of the liquid reach boiling point, the boiling starts. Hence, all the molecules are involved in the boiling process.