An aqueous solution of inorganic compounds (X) gives following reactions.
(i) With an aqueous solution of barium chloride a precipitate insoluble in dilute `HCl` is obtained.
(ii) Addition of excess of `Kl` gives a brown precipitate which turns white on addition of excess of hyposolution.
(iii) With an aqueous solution of `K_(4)[Fe(CN)_(6)`, a brown coloured precipitate is obtained.
Identity (X) and gives equation for the reaction for (i),(ii) and (iii) observations.

Explanation

`X-CuSO_(4)`
`CuSO_(4)+K_(4)[Fe(CN)_(6)] rarr underset("Coloured ppt.")underset("Chocolate")(Cu_(2)[Fe(CN)_(6)])+2 K_(2)SO_(4)`