Question

A water soluble salt 'P' on reaction with sulphuric acid gives the products 'Q', carbon dioxide and water. Identify P and Q.

• A. $P\mathrm{is}{\mathrm{Na}}_2{\mathrm{CO}}_{3}Q\mathrm{is}{\mathrm{Na}}_2{\mathrm{SO}}_4$
• B. $P\mathrm{is}{\mathrm{Na}}_2{\mathrm{SO}}_{4}Q\mathrm{is}{\mathrm{Na}}_2{\mathrm{CO}}_3$
• C. $P\mathrm{is}\mathrm{NaCl}Q\mathrm{is}{\mathrm{Na}}_2{\mathrm{SO}}_4$
• D. $P\mathrm{is}{\mathrm{Na}}_2{\mathrm{CO}}_{3}Q\mathrm{is}\mathrm{NaCl}$

Answer 1

The correct option is A $P\mathrm{is}{\mathrm{Na}}_2{\mathrm{CO}}_{3}Q\mathrm{is}{\mathrm{Na}}_2{\mathrm{SO}}_4$

Metal carbonates on reaction with acids form respective metal salt along with carbon dioxide and water. Among the given options, the water soluble salt sodium carbonate (${\text{Na}}_2{\text{CO}}_3$) will react with sulphuric acid (${\text{H}}_2{\text{SO}}_4$) to form sodium sulphate (${\text{Na}}_2{\text{SO}}_4$) along with carbon dioxide (${\text{CO}}_2$) and water (${\text{H}}_2\text{O}$). The reaction involved is given below:

${\text{Na}}_2{\text{CO}}_3\text{(aq)}+{\text{H}}_2{\text{SO}}_4\text{(aq)}\to {\text{Na}}_2{\text{SO}}_4\text{(aq)}+{\text{CO}}_2\text{(g)}\uparrow +{\text{H}}_2\text{O}\text{(l)}$

So, here P is ${\text{Na}}_2{\text{CO}}_3$ and Q is ${\text{Na}}_2{\text{SO}}_4$.