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Question

The soild moth balls convert directly to and hence diminish over time. This phenomenon is known as .

A
evaporation
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B
liquid
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C
gas
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D
sublimation
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Solution

The correct options are
C gas
D sublimation
Sublimation is the conversion of a substance directly from its solid state to gaseous state without passing through the liquid state. Only certain substances are capable of such a change.

Moth balls (napthalene) are one of these substances. The solid moth balls diminish over time but we never see the liquid naphthalene floating around. They directly turn into gas.

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