Which of the following is a neutralisation reaction?

Correct option is B

The correct answer is (b) NaOH + HCl → NaCl + H₂O

Explanation:

• A neutralisation reaction is a chemical reaction in which an acid and a base react with each other to form salt and water.

• In the reaction NaOH + HCl → NaCl + H₂O, Sodium hydroxide (NaOH) is a strong base and Hydrochloric acid (HCl) is a strong acid.

• They neutralise each other to form Sodium chloride (NaCl), which is a neutral salt, and Water (H₂O).

Information Booster:

• The general form of a neutralisation reaction is:
Acid + Base → Salt + Water

• In ionic form, hydrogen ions (H⁺) from the acid combine with hydroxide ions (OH⁻) from the base to form water.

• Neutralisation reactions are used in daily life, such as antacids neutralising excess stomach acid.

Additional Knowledge:

Fe + CuSO₄ → FeSO₄ + Cu (Option a)
• This is a displacement reaction, where iron displaces copper from copper sulphate solution.

CaCO₃ → CaO + CO₂ (Option c)
• This is a decomposition reaction, where a compound breaks down into simpler substances when heated.

Zn + HCl → ZnCl₂ + H₂ (Option d)
• This is a single displacement reaction between a metal and an acid, producing salt and hydrogen gas.