Question

Which of the following is a neutralisation reaction?

• A. $\mathrm{NaOH}\left(\mathrm{aq}\right)+\mathrm{HCl}\left(\mathrm{aq}\right)\to \mathrm{NaCl}\left(\mathrm{aq}\right)+H_{2}O\left(l\right)$
• B. $2\mathrm{HCl}\left(\mathrm{aq}\right)+2\mathrm{Na}\left(s\right)\to 2\mathrm{NaCl}\left(\mathrm{aq}\right)+H_2\left(g\right)$
• C. ${\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)+H_{2}O\left(l\right)\to 2\mathrm{NaOH}\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(g\right)$
• D. ${\mathrm{NH}}_3\left(\mathrm{aq}\right)+H_{2}O\left(l\right)\to {\mathrm{NH}}_4\mathrm{OH}\left(\mathrm{aq}\right)$

Answer 1

The correct option is A $\mathrm{NaOH}\left(\mathrm{aq}\right)+\mathrm{HCl}\left(\mathrm{aq}\right)\to \mathrm{NaCl}\left(\mathrm{aq}\right)+H_{2}O\left(l\right)$

When an acid reacts with a base, it forms salt and water. This is called neutralisation reaction. Here, only the reaction between hydrochloric acid with sodium hydroxide is a neutralisation reaction since it gives sodium chloride and water as products. The reaction involved is given below:
$\mathrm{HCl}\left(\mathrm{aq}\right)+\mathrm{NaOH}\left(\mathrm{aq}\right)\to \mathrm{NaCl}\left(\mathrm{aq}\right)+H_{2}O\left(l\right)$