i) A black mineral (A) on treatment with dilute sodium cyanide of (B) and (C ). ii) The solution of (B) on reaction with zinc gives precipitate of a 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 ammonia giveing a colourless solution (F). White ppt (E) is ofA. `CuCl`B. `MnCl_(2)`C. `AgCl`D. `ZnCl_(2)`

i) A black mineral (A) on treatment with dilute sodium cyanide of (B)

1.	i) A black mineral (A) on treatment with dilute sodium cyanide of (B) and (C ). ii) The solution of (B) on reaction with zinc gives precipitate of a 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 ammonia giveing a colourless solution (F). White ppt (E) is ofA. `CuCl`B. `MnCl_(2)`C. `AgCl`D. `ZnCl_(2)`
Answer» Correct Answer - C `underset((A))(Ag_(2)S)+underset("dilute solution")(NaCN(aq.))overset("air")(rarr)underset((B))(Na[Ag(CN)_(2)])+underset((C ))(Na_(2)SO_(4))` `2Na[Ag(CN)_(2)]+Zn rarr Na_(2)[Zn(CN)_(4)]+underset((D))(2Ag)` `underset((D))(Ag)+"dil"HNO_(3)Ag^(+) +underset((E))(AgCl(s))` `2AgCl(s)+underset((D))(Na_(2)CO_(3)2Ag)+CO_(2)+2NaCl+O_(2)^(-)` `AgCl(s)+2NH_(3)rarr[Ag(NH_(3))_(2)]Cl`

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