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)`
`2CuSO+(4)+4Kl rarr 2CuI_(2)+underset(darr)(2K_(2)SO_(4)) Cu_(2)I_(2)+I_(2)`
`I_(2)+Na_(2)S_(2)O_(3) rarr Na_(2)S_(4)O_(6)+2 NaI`