Sulphide ores of metals are usually concentrated by both floatation process. Which of the following sulphide ores offers an exception and is concentrated by chemical leaching ?
A. Argentite
B. Galena
C. Copper pyrite
D. Sphalerite

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1 Answers

Correct Answer - D
Galena (PbS), copper pyrite `(CuFeS_2)` and argentite `(Ag_2S)` are concentrated by froth floatation process but sphalerite (ZnS) is concentrated by chemical leaching .

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