Zone refining is based on

Question:

Zone refining is based on the principle that ___________.

(i) impurities of low boiling metals can be separated by distillation.

(ii) impurities are more soluble in molten metal than in solid metal.

(iii) different components of a mixture are differently adsorbed on an absorbent.

(iv) vapours of the volatile compound can be decomposed in pure metal.

Solution:

Option (ii)  impurities are more soluble in molten metal than in solid metal is the answer.

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