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(A) The purification of $Ni$ (Nickel) is carried out by the $Mond's$ process.In this process,impure nickel is heated in a stream of carbon monoxide $(

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Mond's process

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(A) The purification of $Ni$ (Nickel) is carried out by the $Mond's$ process.In this process,impure nickel is heated in a stream of carbon monoxide $(CO)$ at $330-350 \ K$ to form a volatile complex,nickel tetracarbonyl,$[Ni(CO)_4]$.The reaction is: $Ni(s) + 4CO(g) \xrightarrow{330-350 \ K} [Ni(CO)_4](g)$.This complex is then heated to a higher temperature $(450-470 \ K)$,causing it to decompose to give pure nickel.The reaction is: $[Ni(CO)_4](g) \xrightarrow{450-470 \ K} Ni(s) + 4CO(g)$.

Column-$I$	Column-$II$
$(a)$ Boron	$(i)$ Van Arkel method
$(b)$ Tin	$(ii)$ Mond's process
$(c)$ Zirconium	$(iii)$ Liquation
$(d)$ Nickel	$(iv)$ Zone refining

Which method is used for the purification of $Ni$?

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Match the elements in Column-$I$ with methods of purification in Column-$II$.

Column-$I$ Column-$II$

$(a)$ Boron $(i)$ Van Arkel method

$(b)$ Tin $(ii)$ Mond's process

$(c)$ Zirconium $(iii)$ Liquation

$(d)$ Nickel $(iv)$ Zone refining

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