Question

Give a reason for the following observation.

Naphthalene balls disappear with time without leaving any solid.

Answer 1

Sublimation:

• The process of conversion of solid into gaseous form directly without undergoing any change into liquid form is called sublimation.
• Example: Naphthalene balls.
• The principle involved is sublimation.
• Naphthalene balls are in solid-state.
• When they are left in a place uncovered, they undergo sublimation where it is directly converted to vapors (gas) without the intervention of a liquid state.
• They will be disappeared after days when they are uncovered.

Therefore, Naphthalene balls undergo sublimation so they disappear with time without leaving any solid.