Question

Which of the following are examples of neutralisation reaction?

• A. $\text{Ca(s)}+2{\text{HNO}}_3\text{(aq)}\to {\text{Ca(NO}}_3{)}_2\text{(aq)}+{\text{H}}_2\text{(g)}$
• B. ${\text{Mg(OH)}}_2\text{(aq)}+2\text{HCl(aq)}\to {\text{MgCl}}_2\text{(aq)}+{\text{H}}_2\text{O(l)}$
• C. $\text{HCl}\text{(aq)}+\text{NaOH(aq)}\to \text{NaCl(aq)}+{\text{H}}_2\text{O(l)}$
• D. $\text{HBr(aq)}+\text{KOH(aq)}\to \text{KBr(aq)}+{\text{H}}_2\text{O(l)}$

Answer 1

Answer: (B), (C), (D)

$\text{HBr(aq)}+\text{KOH(aq)}\to \text{KBr(aq)}+{\text{H}}_2\text{O(l)}$

In a neutralisation reaction, acid and base react to give salt and water.

Here, the reaction of calcium metal with nitric acid is not an example of a neutralisation reaction because water is not obtained as one of the products. We obtain its corresponding salt (calcium nitrate) and hydrogen gas instead.

All the other options involve the reaction between an acid and a base.