(C) The Van-Arkel process is used for the refining of metals like $Ti$,$Zr$,$Hf$,and $B$ by forming volatile iodides.The Mond's process is specificall

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(C) The Van-Arkel process is used for the refining of metals like $Ti$,$Zr$,$Hf$,and $B$ by forming volatile iodides.The Mond's process is specifically used for the refining of $Ni$ (Nickel) by forming volatile nickel tetracarbonyl,$Ni(CO)_4$.Therefore,the Van-Arkel process is used for $Ti$ (or $Zr$) and the Mond's process is used for $Ni$.