Which one of the following is true in electrolytic refining?

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Impure metal is made cathode.

Impure metal is made anode.

Impure metal is made of cathode and pure metal anode.

Both electrodes must be of pure metal.

answer is B.

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Detailed Solution

The process in which a particular metal is purified is called electrolytic refining. The electrolysis process is used for purifying a metal, during this process to start a chemical reaction of oxidation and reduction current is passed into a solution.

In electrolytic refining, we use cathode and anode. At cathode reduction reaction take place and at anode oxidation take place, 2-strips of metal are taken to purify the metal by electrolysis.
Metal one: Impure metal
Metal strip two: pure metal
The anode is made from impure metal, and a thin strip of pure metal is used at the cathode. During this process, metals ions from anode migrate towards cathode.

Hence, the correct answer is option B.

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