Match List I with List II
| List I | List 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 |
Answer & explanation
Correct answer: option 1
Cyanide process is used for the extraction of Au and Ag.
Froth flotation process is used for dressing of ZnS. This process is used for sulphide ores.
Electrolytic reduction is used in the extraction of Al.
Zone refining is used to obtain ultrapure Ge.