Question

Which compound contains both ionic and covalent
bonds?
(1) CaCO3 (3) MgF2
(2) PCl3 (4) CH2O

Answer 1

The answer is (1) CaCO3. The bond between C and O is covalent bond. And the bond between Ca2+ and CO3 2- ion is the ionic bond. So the compound CaCO3 satisfy this condition.

Answer 2

Answer: The correct answer is option (A).

Explanation:

Covalent bonds are those bonds in which sharing of an electrons is present in between the two atoms. Generally this type of bonding is found when electro-negativity difference between is very less or zero.

Ionic bonds are those bonds in which complete transfer of an electrons from one atom to another atom is present.Generally this type of bonding is found when electro-negativity difference between two atoms is very large.

Compound $CaCO_3$ contains both ionic and covalent bonds.

• Bond between carbon and oxygen atoms in carbonate ion is a covalent bond. Being a ploy-atomic ion it carries 2- charge.
• Calcium ion being 2+ charge will form ionic bond with carbonate ion.