In an aqueous solution of ammonium chloride (NH₄Cl), the following solute particles are present:

* Ammonium ions (NH₄⁺): These are positively charged ions formed when ammonium chloride dissolves in water.

* Chloride ions (Cl⁻): These are negatively charged ions formed when ammonium chloride dissolves in water.

The dissociation reaction is:

NH₄Cl(s) → NH₄⁺(aq) + Cl⁻(aq)

Therefore, the solution contains ammonium ions and chloride ions, which are the solute particles.