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The pulverization of ores is done during

$ (a)\;\text{Crushing and Grinding of ore} \\(b)\;\text {Handpicking of the metal ore} \\(c)\;\text{By applying the Magnetic field.} \\ (d)\;\text{None} $ .
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This is powdering of grinded ore
Hence a is the correct answer.
answered Mar 20, 2014 by meena.p

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