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The process that is not carried out while doing the concentration of an ore is

$ (a)\;\text{Molybdenum} \\(b)\;\text{Chromium} \\(c)\; \text{Cobalt} \\ (d)\;\text{Nickel.} $
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The coloration of stone is because of impurity.
Hence c is the correct answer.
answered Mar 20, 2014 by meena.p

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