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Q.

Which of the following non-metal sublimes on heating?


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a

Iodine crystals

b

Carbon

c

Sulphur

d

All of the above 

answer is A.

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Detailed Solution

Iodine crystals sublime on heating.
The transition of a matter from solid to gaseous form directly is called sublimation. Iodine is a non-metal which sublimates when it is provided with heat. Only van der Waals forces of attraction exist between two iodine molecules. Van der Waals force of attraction is much weaker than covalent bonds.
 
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