* Hydrolysis is a chemical reaction where water is used to break down a compound. In this case, the ammonium nitrate (NH₄NO₃) reacts with water to form ammonium ions (NH₄⁺) and nitrate ions (NO₃⁻).

* Oxidation involves the loss of electrons. This is not the primary process happening here.

* Electrolysis involves using an electric current to drive a non-spontaneous chemical reaction. This is not relevant to the reaction of ammonium nitrate with water.

* Reduction involves the gain of electrons. This is not the primary process happening here.

Why the solution is acidic:

Ammonium ions (NH₄⁺) are acidic because they can donate a proton (H⁺) to water, forming hydronium ions (H₃O⁺), which are responsible for the acidic nature of the solution.