First slide
Concentration of ore

Match items of Column I with the items of Column II and assign the correct code :



 Mac-Arthur Forest cyanide process is used for the extraction of gold and silver. Froth floatation process is used for the concentration of sulphide ores e.g., ZnS.

Electrolytic reduction is used for the extraction of highly electropositive metals like NakMgCaAl, etc. Zone refining method is used for producing semiconductor and other metals of very high purity
e.g., Ge, Si, B, Ga and In. Purification of Ni is done by vapour phase refining (Mond's process).

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