Chemistry - Salt Analysis Question with Solution | TestHub

Paragraph: An aqueous solution of a mixture of two inorganic salts, when treated with dilute $HC$ ?, gave a precipitate $\left(P\right)$ and a filtrate $\left(Q\right)$. The precipitate $\left(P\right)$ was found to dissolve in hot water. The filtrate $\left(Q\right)$ remained unchanged, when treated with ${\mathrm{H}}_2\mathrm{S}$ in a dilute mineral acid medium. However, it gave a precipitate $\left(R\right)$ with $H_{2}S$ in an ammoniacal medium. The precipitate $R$ gave a coloured solution $S$, when treated with ${\mathrm{H}}_2{\mathrm{O}}_2$ in an aqueous $\mathrm{NaOH}$ medium.