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Write the balanced redox reaction: 

(a) MnO4(aq) + Fe2+ (aq) → Mn2+ (aq) + Fe3+ (aq) [acidic medium] 

(b) Cr2O7 2– + Fe2+ → Cr3+ + Fe3+ [Acidic medium] 

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(a) MnO4 (aq) + 5Fe2+ (aq) + 8H+ (aq) → Mn2+ (aq) + 5Fe3+ (aq) + 4H2O(l) 

(b) Cr2O72– + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O.

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