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Blister copper is refined by stirring molten impure metal with green longs of wood because such a wood liberates hydrocarbon gases $({like CH}_{4})$ . The process X is called and the metal contains impurities of Y is _

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${X = cupellation, Y = CuO}_{2}$

${X = polling, Y Cu}_{2} O$

$X = polling, Y = CuO$

$X = cupellation, Y = CuO$

answer is B.

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${X = polling, Y Cu}_{2} O$

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