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Question

Diamond is not good conductor of electricity because

A
it is very hard.
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B
its structure is very compact.
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C
it is not soluble in water.
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D
it has no free electrons.
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Solution

The correct option is D it has no free electrons.
Free electrons help in conduction of electricity. In the 3-D structure of diamond, each carbon atom is covalently bonded to four other carbon atoms and thus, there are no free electrons and hence, it does not conduct electricity.

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