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Match the metals in Column-I with their extraction features in Column-II. Column-I (Metals): (A) Zn (B) Cu (C) Ag (D) Au Column-II: (P) Cyanide process used in commercial extraction (Q) Extracted by a hydrometallurgical process (R) Roasting involved in commercial extraction (S) Present in brass

1. A->R,S; B->R,S; C->P,Q; D->P,Q
2. A->P; B->Q; C->R; D->S
3. A->S; B->P; C->R; D->Q
4. A->P,Q; B->R; C->S; D->R,S

Correct answer: A->R,S; B->R,S; C->P,Q; D->P,Q

Solution

Zn and Cu sulphide ores are roasted and both occur in brass, while Ag and Au are extracted by cyanide-based hydrometallurgy.

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