Question

Which of the following compounds contain(s) both ionic and covalent bonds?

• A. $N{H}_{4}Cl$
• B. $KCN$
• C. $CuS{O}_4\cdot 5H_{2}O$
• D. $NaOH$

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A $N{H}_{4}Cl$
B $KCN$
C $CuS{O}_4\cdot 5H_{2}O$
D $NaOH$

A) $N{H}_{4}Cl$ contains both an iconic and covalent bond. The ammonium ion is polyatomic, which means it forms ionic salts. Therefore whatever bonds it makes are ionic. However, the bond between N and H is covalent because both N and H are non-metals.

B) Bond between $K^{+}$ and $C{N}^{-}$ is ionic whereas bond within $C{N}^{-}$ is covalent. Hence both ionic and covalent bonds are present in KCN.

C) A covalent bond is formed between sulfur and oxygen as they both are non-metals and the bond between copper and sulfate is ionic one is metal and other is non-metal. Hydrated copper sulfate is a complex which is bonded to water molecules acting as ligands forming a coordinate bond.

D) As strong covalent bonds exist between the atoms of a polyatomic ion, it is difficult to break it. In each hydroxide ion the Oxygen atom and the H atom are bonded via covalent bonds, but the $O{H}^{-}$ and $N{a}^{+}$ are held together in a crystal lattice via ionic bonds, thus making NaOH an ionic compound.

Hence, all options are correct.