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(D) The principle of $Zone \ refining$ is that impurities are more soluble in the melt than in the solid state.The $Vapour \ phase \ refining$ method

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chromatographic method

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(D) The principle of $Zone \ refining$ is that impurities are more soluble in the melt than in the solid state.The $Vapour \ phase \ refining$ method is based on converting an impure metal into a volatile compound,which is then decomposed to obtain the pure metal.The $Liquation$ method is based on the difference in melting points of the metal and the impurities,where the metal flows on a sloping surface.The $Chromatographic$ method is based on the principle that different components of a mixture are adsorbed to different extents on an adsorbent. As the mobile phase moves through the stationary phase,these components separate based on their differential adsorption. Therefore,the correct option is $D$.

The method,which is based on the principle that "different components of a mixture are differently adsorbed on an adsorbent" is called

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