Which one of the following is a covalent compound?

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1. Explanation:

   Covalent Bonds:

   • Covalent bonds are mostly found in organic compounds.
   • They are non-metallic weaker bonds.
   • Compounds having covalent bonds occur in liquid or gaseous states if in solid, they are soft solids.
   • They are bad conductors of heat and electricity.
   • Compounds having covalent bonds have low melting and boiling points.
   • Covalent compounds are insoluble in water and organic solvents.
   • Covalent bonds are of two types – sigma (strong) and pi (weak).

   Important Points

   Calcium Oxide:

   • Its formula is CaO
   • It is an ionic compound.
   • It is a white or greyish white solid substance.
   • It can absorb carbon dioxide from the atmosphere easily,

   Sodium Nitride:

   • Its formula is Na₃N
   • It is an ionic compound.
   • It has a gap that is usually found in semiconductors.
   • It is formed from metal to non-metal interactions.

   Silicon Carbide:

   • Its formula is SiC.
   • Silicon carbide has a strong covalent bond between them.
   • It is also known as the covalent network solid.
   • It has oxidation resistance and thermal shock resistance.

   Zinc Sulphide:

   • Its formula is ZnS
   • It is an ionic compound.
   • It is usually black in colour due to various impurities and is thus used as a pigment.
   • It is used as a window in optics.

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