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Match the following :
List - I List - II
A. Cyanide process a. Ultrapure Ge
B. Floatation process b. Pine oil
C. Electrolytic reduction c. Extraction of Al
D. Zone refining d. Extraction of Au
A B C D
1. c a d b
2. d b c a
3. c b d a
4. d a c b

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answer is B.

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Detailed Solution

Cyanide Process: Silver and gold are extracted by the cyanide process (Mac Arthur - Forrest process)
Froth Floatation Process:- The process is best suitable for sulphide ores. The process is based on different wetting characteristics of the ore and gangue particles with water and pine oil.
Electrolytic Reduction: Al, Cu, Ag, Mg etc are purified by this method. Pure metal is used as cathode and crude metal is used as anode. Aqueous solution of salt of the metal acts as electrolyte.
Zone Refining: This method is employed to get metal of very high purity i,e. ultra pure samples of Ge Si, B,Ga,In. This method is based on the fact that impurities are more soluble than the pure metal in the melt.

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