Identify the phenomenon due to which the size of solid balls of naphthalene or camphor get reduced after few weeks.

Evaporation

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Melting

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Sublimation

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Condensation

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Solution

The correct option is C Sublimation
The camphor or naphthalene balls when left open slowly change their state directly from solid to gas. This phenomenon of conversion of a substance directly from solid state to gaseous state without passing through liquid phase is called sublimation. Due to this conversion, the size of naphthalene or camphor balls reduces.

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Naphthalene balls kept in coat pockets disappear after a few months due to ____________.

Naphthalene balls get smaller in size when kept exposed for a few days, due to sublimation.

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