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Q.

Which of the following metal is NOT purified by Van Arkel method?

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a

Zr

b

Ti

c

Ni

d

Hf

answer is C.

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Detailed Solution

Nickel (Ni) metal is not purified by the Van Arkel method.

Zirconium or titanium can be refined using the Van Arkel technique. By heating metal in an evacuated vessel with iodine, oxygen, and nitrogen that are present as impurities are eliminated in this process. When heated to roughly 1800K, the produced metal iodide decomposes on a tungsten filament because it is volatile.

Hence, option C is correct

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