Extraction of silver from `Ag_(2)S` by the use of sodium cyanide is example of

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Extraction of silver from `Ag_(2)S` by the use of sodium cyanide is example of A. `NaSO_(4)` B. `Na_(2)S` C. `2Na[Ag(CN)_(2)]` D. `Na_(2)ZnSO_(4)`

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