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B
Bad conductor of electricity
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C
Very hard in nature
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D
Highly malleable
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Solution
The correct options are B Bad conductor of electricity C Very hard in nature
Diamond is a crystalline allotrope of carbon. In diamond, each carbon atom is covalently bonded to four other carbon atoms, forming a rigid tetrahedral structure. These bonds are strong, hence, require a lot of energy to break. Thus, it has a high melting point.
Diamond does not have any free electron in its structure, which is required to conduct electricity. Hence, it is a poor conductor of electricity.
Malleability is the property by which a substance can be beaten into thin sheets. Diamond is not malleable in nature.