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

When the redox reaction.
`Cr_(2)O_(7)^(--)+C_(2)H_(4)OtoC_(2)H_(4)O_(2)+Cr^(++)` is balanced by ion electron method in acidic medium.
what is correct co-efficient of `H^(+)` ions.

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