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Cr2O72-+H++ Fe2+ 2Cr3+H2O+Fe3+
Cr2O72-+14H++Fe2+2Cr3++7H2O+Fe3+
Cr2O72-+14H++6Fe2+2Cr3++7H2O+6Fe3+
Cr2O72-+10H++Fe2+2Cr3++5H2O+6Fe3+
ANS : 3
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