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When the redox reaction Cr(2)O(7)^(--)...

When the redox reaction
`Cr_(2)O_(7)^(--)+Fe^(++)+C_(2)O_(4)^(--)toCr^(+++)+Fe^(+++)+CO_(2)`
balanced by ion electron method in acid medium what is correct co-efficient of `Cr_(2)O_(7)^(--)`

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