Q. 165.0( 2 Votes )

i. Giving one exa

Answer :

i. a. Metals like gold and silver present low in the activity series are extracted from their oxides by heating in air alone.

b. Metals like zinc and iron which are present in the middle of the series can be obtained by reduction with carbon.

ii. The removal of impurities from reduced metals is called refining.

In electrolytic refining of M:

Cathode: Strip of pure metal M

Anode: Impure metal M

Electrolyte used: A solution of the metal salt M

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