Chemistry - Salt Analysis Question with Solution | TestHub

An inorganic Compound$\text{'}\mathrm{X}\text{'}$on treatment with concentrated${\mathrm{H}}_2{\mathrm{SO}}_4$produces brown fumes and gives dark brown ring with${\mathrm{FeSO}}_4$in presence of concentrated${\mathrm{H}}_2{\mathrm{SO}}_4$. Also Compound$\text{'}\mathrm{X}\text{'}$gives precipitate$\text{'}\mathrm{Y}\text{'}$, when its solution in dilute$\mathrm{HCl}$is treated with${\mathrm{H}}_2\mathrm{S}$gas. The precipitate$\text{'}\mathrm{Y}\text{'}$on treatment with concentrated${\mathrm{HNO}}_3$followed by excess of${\mathrm{NH}}_4\mathrm{OH}$further gives deep blue coloured solution, Compound$\text{'}\mathrm{X}\text{'}$is: