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Q.

A hard, crystalline solid with a high melting point. does not conduct electricity in any phase. This solid is most likely :

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a

a network covalent solid

b

a molecular solid

c

a metallic solid

d

an ionic solid

answer is D.

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Detailed Solution

Because of the connections between their covalent bonds, covalent solids have high melting points. 

Covalent solids do not conduct electricity in the solid state as well as in the molten state because they lack free electrons. 

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