Question

Which of the following substances contains both covalent and ionic bonds?

a. sodium sulfate

b. Iodine pentafluoride

c. hydrogen cyanide

d. water

Answer 1

Ionic bonds are formed by the transfer of electrons, thus forming one positive and one negative ion. On the other hand, covalent bonds are formed by sharing of electrons between the atoms.

In sodium sulphate (Na2SO4) there is ionic bond between Na and S, and covalent bond between S and O.

In iodine pentafluoride (IF5), the 5 I-F bonds are covalent.

In hydrogen cyanide (HCN), both H-C and C-N bonds are covalent in nature.

In water (H2O), the O-H bonds are covalent in nature.

Hence option (a) is correct.

Hope this helps, thanks!