Diamond is not good conductor of electricity because

it is very hard.

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its structure is very compact.

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it is not soluble in water.

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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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Similar questions

Answer the following questions :

(a) Why is graphite a good conductor of electricity but not diamond ?

(b) Why is diamond very hard ?

(d) What impurity is present in black diamond ?

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