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Explain polling process. |
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Answer» Solution :(1) Polling process is a process of refining IMPURE metals. (2) This method is GENERALLY used in the purification of Cu and Sn which contain oxide impurities. (3) In this process, the impure melted and sitrred with green logs of wood. (4) Due to the heat of molten metal, the green logs LIBERATE hydrocarbon gases which reduce metal oxides if FORMED to pure metal. (5) In case of impure copper (98% pure), may be made `99.5%` pure after the polling process. |
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