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

Evaporation

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Sublimation

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Condensation

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Crystallisation

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Solution

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

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