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One litre of acidified KMnO(4) solution ...

One litre of acidified `KMnO_(4)` solution containing 15.8g `KMnO_(4)` is decolourized by passing sufficient `SO_(2)` . If `SO_(2)` is produced by `FeS_(2)` , what is the amount of `FeS_(2)` required to give desired `SO_(2)`?

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