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Which of the following is true about the...

Which of the following is true about the electrolytic refining of metals ?

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Poling of refining : In this method, the molten metal is stirred with logs of green wood. Then, the impurities are reñoved either as gases or they get oxidised and form scum over the surface of the molten metal.
Ex: Blister, copper is purified by this method. The reducing gases, evolved from the wood, prevent the oxidation of copper
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