Answer:
(a)
Electrolytic refining: This method is used for refining of metals and based
upon the phenomenon of
electrolysis. 1
Copper
is refined using an electrolytic method. The reaction occurring at electrodes, are:
e.g.,
At
anode:
At
cathode:
(b)
Vapour phase refining: This method is based on the fact that certain
metals are converted to their volatile compounds while the impurities are not
affected during compound formation. The compound decomposes on heating to give
pure metal. 1
e.g..
Nickel is refined by vapour phase refining.
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