Which of the following non-metals sublimes on heating?

Fluorine

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Chlorine

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Bromine

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Iodine

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Solution

The correct option is D Iodine
Iodine crystals sublime because though there are covalently bonded within the molecule holding two iodine atoms together, only Van der Waals' forces exist between the iodine molecules. Van der Waal's forces are very weak interactions between molecules of a substance hence the Iodine molecules can escape from the solid structure easily.

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