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Q.

A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a / an :

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a

 Ionic solid 

b

 Molecular solid 

c

Metallic solid

d

Covalent solid 

answer is D.

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Detailed Solution

The reason is covalent solids do not have free or unpaired electron to move and conduct heat or electricity.

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