First slide

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

 Column I Column II
A.Cyanide process1.Ultrapure Ge
B.Froth floatation process2.Dressing of ZnS
C.Electrolytic reduction3.Extraction of Al
D.Zone refining4.Extraction of Au
  5.Purification of Ni


A - 4 ; B - 2 ; C - 2 ; D - 1
A. Cyanide process is used for extraction of Au through formation of anionic complex [Au CN)2]-.
B. Froth floatation process is used for dressing of ZnS.
C. Electrolytic reduction method is used for extraction of aluminium. Graphite electrode is used for this purpose.
D. Zone refining is used for purification of Ge.

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