Question

"Naphthalene balls kept in a cupboard disappear over a period of time. Why?​

Answer 1

Explanation:

Naphthalene or mothballs kept between clothes disappear over a period of time because naphthalene balls undergo sublimation and form naphthalene vapours, which disappear into the air.

Answer 2

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Naphthalene balls kept in a cupboard disappear over a period of time. Why?

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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.