Question

state the principal of refining of metal by following methods. a) zone refining b) electrolytic refining c) vapour phase refining​

Answer 1

Answer:

zone refining

Explanation:

it is used for refining si,B, Ga and in etc.

impurities are more soluble in the molten state of metal than in solid state.

Electrolyic refining

IT is carried out for refining of impure zinc. The anode is impure zinc and cathode is pure zinc. the electrolyte is a mixture of zinc sulphate and dilute sulphuric acid when current is passed. Zinc is deposited on the cathode and is collected.m

At anode : Zn- Zn²+2e-

At cathode: Zn²+2e- - Zn

vapour phase

Metal is connected into volatile compounds and then decomposed to obtain pure metal. this method is used for refining Ni,Zr and Ti. Ni is heated with Co to form volatile nickel tetracarbonyl.

Ni+4co -330-350 k Ni CO 4

Answer 2

Explanation:

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