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

$(a)\;\text{Molybdenum} \\(b)\;\text{Chromium} \\(c)\; \text{Cobalt} \\ (d)\;\text{Nickel.}$

## 1 Answer

The coloration of stone is because of impurity.
Hence c is the correct answer.
answered Mar 20, 2014 by

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