Assign reason for the following
Naphthalene balls disappear when kept in air for few days.

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Solution

Naphthalene balls disappear when kept in the air for a few days because,
Naphthalene balls undergo sublimation easily in which there is a change of state from solid to gas without undergoing into a liquid state.
Naphthalene balls keep forming vapours that disappear into the air with time without leaving any solid.
Hence, Naphthalene balls disappear when kept in the air for a few days.

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