Question

How are impirities lik Co2 removed in maltallugy

Answer 1

Answer:

Impurities like CO2 are removed from metals by the process of Electrolytic refining.

Explanation:

•Electrolytic refining means refining by electrolysis.

•Many metals like tin, lead, chromium, copper, zinc, nickel, silver and gold are refined electrolytically.

For the refining of an impure metal by electrolysis:

(a) A thick block of the impure metal is made anode.(connected to +ve terminal of the battery).

(b) A thin strip of the pure metal is made cathode.(connected to the -ve terminal of the battery).

(c) A water soluble salt (of the metal to be refined) is taken as electrolyte.

☆On passing current,impure metal dissolve from anode and goes into electrolyte solution.And pure metal from the electrolyte deposits on the cathode.The soluble impurities present in the impure metal go into the solution whereas the insoluble impurities settle diwn at the bottom of the anode as 'anode mud'.

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