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To a solution containing Ca^(2+), Ag^(+)...

To a solution containing `Ca^(2+)`, `Ag^(+)`. `Cu^+` and `K^+` 2 M HCl is added when a white ppt. (A) is obtained. After filtration `H_(2)`S is passed through the filtrate, a black ppt. (B) is formed. On removing (B) by filtration it gave white ppt. (C) with conc. `Na_2CO_3`, solution. Identify (A) (B) and (C).

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