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Question

Four metals and their methods of refinement are given
(i) Ni,Cu,Zr,Ga
(ii) Electrolysis, Van Arkel process, zone refining, Mond's process
Choose the right method for each:


A
Ni: Mond's process, Cu: Electrolysis, Zr: Van Arkel process, Ga: Zone refining
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B
Ni: Mond's process, Cu: Van Arkel process, Zr: Zone refining, Ga: Electrolysis
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C
Ni: Electrolysis, Cu: Zone refining, Zr: Van Arkel process, Ga: Mond's process
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D
None of the above
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Solution

The correct option is A Ni: Mond's process, Cu: Electrolysis, Zr: Van Arkel process, Ga: Zone refining
Nickel is converted to an unstable volatile intermediate by heating it with CO.
This is then decomposed at an elevated temperature to obtain pure Ni
Zr and Ti are refined by the Van Arkel - de Boer process. They are converted
into their iodides which are volatilized in an evacuated vessel. 
The iodides are decomposed at temperatures as high as 1400 °C.
Blister Cu is refined electrolytically. Gallium is refined using the zone
refining process to get ultra-pure metals!
 

Chemistry

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