Question

Explain: (i) Zone refining (ii) Column chromatography.

Answer 1

(i) The process of zone refining is based on the concept of the more solubility of the impurities in the molten state of the metal than the solid state. In this process the impurities are stored in the end of the rod made of impure metal which is used in the process. These impurities are removed.

(ii) The column chromatography is known as the process of separating various components of any mixture.

Answer 2

This method is based on the principle that impurities are more soluble in the molten state of metal (the melt) than in the solid state. ... This process is repeated several times, which leads to the segregation of impurities at one end of the rod.