Vapour phase refining method is applicable on

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(D) Vapour phase refining is a process used for the purification of metals by converting them into a volatile compound and then decomposing it to obta

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(D) Vapour phase refining is a process used for the purification of metals by converting them into a volatile compound and then decomposing it to obtain the pure metal. $1$. $Ni$ is purified by the $Mond$ process,where it reacts with $CO$ to form $Ni(CO)_4$,which is then decomposed at high temperature. $2$. $Ti$ and $Zr$ are purified by the $van$ $Arkel-de$ $Boer$ process,where they react with $I_2$ to form volatile iodides ($TiI_4$ and $ZrI_4$),which are then decomposed on a tungsten filament. Therefore,all the given metals can be purified by vapour phase refining methods.

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