Which one of the following is a covalent compound?

Calcium oxide

Sodium nitride

Silicon carbide

Zinc sulphide

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This question was previously asked in

UPSC NDA-1 – 2022

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Among the given options, Silicon carbide (SiC) is predominantly a covalent compound.

Covalent compounds are formed by the sharing of electrons between atoms, typically non-metals or metalloids. Ionic compounds are formed by the transfer of electrons between a metal and a non-metal, resulting in the formation of ions held together by electrostatic attraction.

Calcium oxide (CaO), Sodium nitride (Na₃N), and Zinc sulphide (ZnS) are compounds formed between a metal and a non-metal. While ZnS has some covalent character, CaO and Na₃N are strongly ionic. SiC is a ceramic material where silicon and carbon atoms are bonded covalently in a crystal lattice structure, forming a giant covalent network.

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