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For the redox reaction xFe^(2+)+yCr(2)...

For the redox reaction
`xFe^(2+)+yCr_(2)O_(7)^(2-)+zH^(+) rarr Fe^(3+)+Cr^(3+)+H_(2)O`
`x`, `y` and `z` are

Text Solution

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Fe equation multiplied with 6 and `Cr_(2)O_(7)^(-2)` equation multiplied with 1.
`" "6Fe^(2+)+overset(+6)(Cr_(2))O_(7)^(2-) rarr 6Fe^(3+)+2Cr^(3+)`
Balance all the atoms other than O and H.
`" "6Fe^(2+)+Cr_(2)O_(7)^(2-) rarr 6Fe^(3+)+2Cr^(3+)`
Balance the O by adding `H_(2)O` molecule.
`" "6Fe^(2+)+Cr_(2)O_(7)^(2-)+14H^(+) rarr 6Fe^(3+)+2Cr^(3+)+7H_(2)O`
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