Which of the following statements are true regarding diamond?

Diamond is the hardest substance

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It is three dimensional natured

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It is a good conductor of electricity

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Used as gems in jewellery and abrasives

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Solution

The correct options are
A Diamond is the hardest substance
B It is three dimensional natured
D Used as gems in jewellery and abrasives
Diamond is the hardest naturally occurring substance because it is $s p_{3}$ hybridized with strong covalent bonds. The strong covalent bonds cause the three-dimensional cage-like structure of diamond.
Diamond is a bad conductor of electricity because of lack of unpaired $e^{-}$ in the outmost shell.
It is used in jewelry due to its high refractive nature.
Due to its hardness, it is used as an abrasive.

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