Which of the following solid undergoes sublimation?

Ice

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Sodium chloride

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Aluminum

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Iodine

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Solution

The correct option is D Iodine
Iodine crystals do not melt on heating but change directly to the
gaseous state. For example, when the fumes of iodine touch a cool surface, they cool down and form solid crystals of iodine and stick to the surface.
Thus, iodine undergoes sublimation.

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