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Name the substance oxidised and the subs...

Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reactions :
(a) `3MnO_(2) +4Al to 3Mn +2Al_(2)O_(3)`
(b) `Fe_(2)O_(3) + 3CO to 2Fe + 3CO_(2)`
(c) `SO_(2) + 2H_(2)S to 3S +2H_(2)O`

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