Which of the following is an element?

Sand

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Diamond

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NaCl

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Glass

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Solution

The correct option is C Diamond
Diamond is a metastable allotrope of carbon, where each carbon atom is bonded covalently with other surrounding four carbon atoms. It is made up of only carbon atoms.
NaCl- comman salt. It is a compound.
Sand- Its chemical formula is, $S i O_{2}$ which is a compound.
Glass- It is a mixture of many oxides with the main oxide being $S i O_{2}$ .
Hence, option B is correct.

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