Identify the species among the following that contains both ionic and covalent bonds, and also exhibits coordinate covalent bonding.

Solution

1. ${\text{NH}}_4{\text{NO}}_3$ consists of ${\text{NH}}_4^{+}$ and ${\text{NO}}_3^{-}$ ions, which are held by ionic bonds.
2. Within ${\text{NH}}_4^{+}$, there are $3$ covalent $\text{N-H}$ bonds and $1$ coordinate $\text{N}\to \text{H}$ bond.
3. Within ${\text{NO}}_3^{-}$, there are covalent bonds and a coordinate bond from $\text{N}$ to $\text{O}$.
4. Hence the answer is (D).