Question

naphthalene balls disappear with time without leaving a solid​

Answer 1

Explanation:

Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.

Naphthalene balls are sublime in nature which changes directly from solid to vapours. So,due to sublimation it disappear if kept in air for few weeks.

Answer 2

Naphthalene undergo sublimation, i.e., they directly become vapours from solids without undergoing the liquid state. Hence, when they disappear, they are actually turning into vapuors over time.