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Describe the principle involved in each of the following processes.
(i) Mond process for refining of Nickel.
(ii) Column chromatography for purification of rare elements.

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(i) In Mond process, nickel is converted into its volatile complex, teracarbonyl nickel and gets collected elsewhere. It is then decomposed to give pure nickel.

(ii) Column chromatography is based on the principle that different components of a mixture are differently adsorbed on an adsorbent. In purification of rare earth elements ion-exchange is used as an adsorbent.

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