Balance the following reaction by ion - electron method: \[ \mathrm...

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Balance the following reaction by ion - electron method:
\[
\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{Fe}^{+2}+\mathrm{H}^{+} \rightarrow \mathrm{Cr}^{+3}+\mathrm{Fe}^{+3}
\]
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