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The method of zone refining of metals is based on the principle of:
Greater mobility of the pure metal than that of impurity.
Higher melting point of the impurity than that of the pure metal.
Greater noble character of the solid metal than that of the impurity
Greater solubility of the impurity in the molten state than in the solid
Solution
This method is based on the principle that the impurities are more soluble in the melt than in the solid state of the metal. A circular mobile heater is fixed at one end of a rod of the impure metal.
The molten zone moves along with the heater which is moved forward.
As the heater moves forward, the pure metal crystallises out of the melt and the impurities pass on into the adjacent molten zone.
Similar Questions
List $-I$ contains different compound formed during extraction of metal $(M)$ in List $-II$
| List $-I$ | List $-II$ | ||
| $(P)$ | $[M(CN)_2]^-$ | $(1)$ | $Ni$ (during refining of metal) |
| $(Q)$ | $[M(CO)_4]$ | $(2)$ | $Ti$ (during refining of metal) |
| $(R)$ | $MI_4$ | $(3)$ | $Pb$ (during roasting of ore) |
| $(S)$ | $MO$ | $(4)$ | $Ag$ (during leaching of ore) |
