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

Column I

Column II

A.Cyanide process

1.Ultrapure Ge

B. Froth floatation process

2.Dressing of ZnS

C.Electrolytic reduction

3.Extraction of Al

D.Zone refining

4.Extraction of Au

5.Purification of Ni

A

B

C

D

2 3 1 5

A

B

C

D

1 2 3 4

A

B

C

D

3 4 5 1

A

B

C

D

4 2 3 1

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