Which one of the following gas is most soluble in water?

The correct option is C

${\mathrm{NH}}_3$

The explanation for correct option

(C) ${\mathbf{NH}}_{\mathbf{3}}$

Solubility of gases in liquid

• Temperature and pressure, as well as the type of the solute and the solvent, have an impact on gas solubility in liquids.
• Many gases dissolve readily in water, whereas others do not dissolve in water under typical circumstances.
• Due to the action of various forces of attraction between molecules, the chemical structure of a solute or solvent will influence the solubility of a gas in water.

Ammonia gas

• Ammonia is a colorless gas with a chemical formula${\mathrm{NH}}_3$.
• Due to hydrogen bonding with water, it is most soluble in water and is polar as well.

The explanation for incorrect options

• Ammonia gas is most soluble in water.
• Hence all other options (A), (B), and (D) are incorrect.

Therefore, the correct option is (C) ${\mathbf{NH}}_{\mathbf{3}}$.