Which of the following metals can be extracted through alkali leaching technique?
(1) Cu        (2) Sn        (3) Pb        (4) Au

Answer: Option 3
Solution:
Cynaide Leaching: Ag, Au
Ammonia Leaching: Ni, Cu, Co
Alkali Leaching: Al, Zn, Pb
Acid Leaching: ZnS, PbS

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