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(i) A black mineral (A) on treatment wit...

(i) A black mineral (A) on treatment with dilute sodium cyanide solution in presence of air gives a clear solution of (B) and (C).
(ii) The solution of (B) on reaction with zinc gives a precipitate of metal (D).
(iii) (D) is dissolved in dil. `HNO_(3)` and the resulting solution gives a white precipitate (E) with dil. HCL
(iv) (E) on fusion with sodium carbonate gives (D).
(v) (E) dissolves in aqueous solution of ammonia giving a colourless solution of (F). Identify (A) to (F) and give chemical equations for reactions at steps (i) to (V).

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