Question

The soild moth balls convert directly to and hence diminish over time. This phenomenon is known as .

• A. evaporation
• B. distillation
• C. gas
• D. sublimation

Answer 1

Answer: (C), (D)

The correct options are
C gas
D sublimation

Sublimation is the conversion of a substance directly from its solid state to gaseous state without passing through the liquid state. Only certain substances are capable of such a change.

Moth balls (napthalene) are one of these substances. The solid moth balls diminish over time but we never see the liquid naphthalene floating around. They directly turn into gas.