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Balance the net equtation for the reacti...

Balance the net equtation for the reaction of potassium dichromate (VI), `K_(2) Cr_(2) O_(7)`, with sodium sulphite, `Na_(2)SO_(3)`, in an acid solution to give chromium (III) ion and and sulphate ion.
Strategy : Follow the seven -step proceduce , one step at a time.

Text Solution

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Skeleton equation is
`Cr_(2)O_(7)^(-)+SO_(3)^(2-) rarr Cr^(3+)+SO_(4)^(2-)`

`Cr_(2)O_(7)^(2-)+3SO_(3)^(2-) rarr 2Cr^(3+)+3SO_(4)^(2-)`
`Cr_(2)O_(7)^(2-)+3SO_(3)^(2-) rarr 2Cr^(3+)+3SO_(4)^(2-)+4H_(2)O`
`Cr_(2)O_(7)^(2-)+3SO_(3)^(2-)+8H^(+) rarr 2Cr^(3+)+3SO_(4)^(2-)+4H_(2)O`
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