Question

Your mother preserves woolen clothes using naphthalene balls, which disappear agter some time, give reasons.

Answer 1

Naphthalene balls disappear as they show sublimation in this process they directly change from solid state to Vapour State.

Answer 2

Your mother preserves woolen clothes using naphthalene balls, which disappear after some time,because, the naphthalene balls under go a process called sublimation .
Sublimation means the process of changing of solid into vapour,