Outline the principles behind the refining of metals by the following methods: (i) Zone refining method (ii) Chromatographic method

(i) Zone refining: 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.
(ii) Chromatographic method-This method is based on the principle that different components of a mixture are differently adsorbed on an adsorbent