Answer: 1. water
Step-by-step explanation:
Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.

When hydrochloric acid ad sodium hydroxide combines, the
ions from acid combines with
ions from base to form water and sodium chloride
which is soluble in water.
.
Thus water is always produced in the reaction between hydrochloric acid and sodium hydroxide.