Which equation represents a neutralization reaction?1) CaO + H2O → Ca (OH) 22) 2HCl + Zn → ZnCl2 + H23) H2SO4 + CaCO3→ CaSO4 + H2O + CO24) HNO3 + KOH → KNO3 + H2O

4) HNO₃ + KOH → KNO₃ + H₂O.

Explanation:

The neutralization reaction is the reaction between an acid and a base that results in a salt and water.

So, the right choice is:

4) HNO₃ + KOH → KNO₃ + H₂O.

Where, an acid (HNO₃) reacts with a base (KOH) and results in a salt (KNO₃) and water.