Question

Coordinate bond is present in:

• A. Hydronium ion
• B. Water
• C. Sulphur dioxide
• D. Ammonia

Answer 1

The correct option is A Hydronium ion

From the given compounds only Hydronium ion forms a coordinate or dative bond, where $O$ is the donor atom and $H$ is the acceptor.

Hydronium ion can be shown as:
$H_{2}O\to H^{+}$ or $H_3{O}^{+}$.
Hence, the correct option is A.