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A black coloured compound (A) on reactio...

A black coloured compound `(A)` on reaction with dilute `H_(2)SO_(4)` gives a gas `(B)` which on passing in a solution of an acid `( C)` gives a white turbidity `(D)`.Gas `(B)` when passed in an acidified solution of a compound `(E)` gives a precipitate `(F)` soluble in dilute `HNO_(3)`.After boiling this solution when an excess of `NH_(4)OH` is added a intense blue coloured compound `(G)` is formed. To this solution on addition of acetic acid and aqueous `K_(4)[Fe(CN)_(6)]` a chocolate brown precipitate `(H)` is obtained.On addition of an aqueous solution of `BaCl_(2)` to an aqueous solution of `(E)` a white precipitate insoluble in dilute `HCl` is obtained. Identify the compounds from `(A)` to `(H)`.

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