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Impure tin contains `SnO_(2)` as one of the impurities. Name the specific method employed for converting `SnO_(2)` present in impure metal to tin.

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Poling is used as a method of purification of metals when they have their oxides as impurity. For example, `Cu` has `Cu_(2)O` as impurity, `Sn` has `SnO_(2)` as impurity,e tc.

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