Q.
Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?
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Rajasthan PETRajasthan PET 2011
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Solution:
Galena (PbS), copper pyrite (CuFeS2) and argentite (Ag2S) are concentrated by froth floatation process but sphalerite (ZnS) is concentrated by chemical leaching.