Which statement best describes a neutralization reaction?

• A. A reaction between an acid and a base to form a salt and water.
• B. A reaction that breaks down a compound into simpler substances.
• C. A reaction in which electrons are transferred between substances.
• D. A reaction that forms a precipitate.

Answer: (A)

Neutralization reactions are acid–base reactions where an acid reacts with a base to form a salt and water. The essential idea is that the acid donates a proton (H+) and the base donates a hydroxide (OH−); they combine to make water, and the remaining ions pair up to form a salt. For example, hydrochloric acid reacting with sodium hydroxide yields sodium chloride and water: HCl + NaOH → NaCl + H2O. This is a classic acid–base process and is often exothermic. The other descriptions describe different reaction types: breaking a compound into simpler substances is decomposition; electron transfer between substances is a redox reaction; forming a precipitate is a precipitation reaction.