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Which substance is oxidised and which su...

Which substance is oxidised and which substance/ion is reduced in the following reactions?
(i) `PbS+4H_(2)O_(2) to PbSO_(4)+4H_(2)O`
(ii) `H_(2)S+2FeCl_(3) to 2FeCl_(2)+2HCl+S`
(iii) `MnO_(2)+4HCl to MnCl_(2)+2H_(2)O+Cl_(2)`
(iv) `SnCl_(2)+2FeCl_(3)+ to SnCl_(2)+2FeCl_(2)`
(v) `2MnO_(4)^(-)+16H^(+)+5CrO_(4)^(2-)to 2Mn^(2+)+8H_(2)O+10CO_(2)`
(vi) `3N_(2)H_(4)+2BrO_(3)^(-) to 3N_(2)+2Br^(-)+6H_(2)O`
(vii) `Cl_(2)+SO_(3)^(2-)+H_(2)O to 2Cl^(-)+SO_(4)^(2-)+2H^(+)`
(viii) `2I^(-)+Cl_(2) to 2Cl^(-)+I_(2)`

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