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underset("(aq)")(Cr(2)O(7)^(-2)) + under...

`underset("(aq)")(Cr_(2)O_(7)^(-2)) + underset("(aq)")(SO_(3)^(-2))to underset("(aq)")(Cr^(+3)) + underset("(aq)")(SO_(4)^(-2))` (Acidic medium)

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Equation increase and decrease in oxidation number
`Cr_(2)O_(7)^(-2)+ 3SO_(3)^(-2) to 2Cr^(+3) + 2SO_(4)^(-2)`
In acidic medium add `4H_(2)O` to RHS and `8H^(+)` to LHS
`underset("(aq)")(Cr_(2)O_(7)^(-2)) + underset("(aq)")(3SO_(3)^(-2)) + underset("(aq)")(8H^(+)) tounderset("(aq)") (2Cr^(+3)) + underset("(aq)")(3SO_(4)^(-2))+ underset("(aq)")(4H_(2)O)`
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