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Outline the principle of the method used...

Outline the principle of the method used for refining of
(a) Nickel (b) Zirconium (c ) Tin

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(a) Refining of nickle : Mond's process. (b) Refining of Zirconium : Van Arkel Method. (c ) Refining of tin : Electro-refining.
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Name the method used for the refining of (i) Nickel (ii) Zirconium.

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