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O balancing the given redox reaction, a...

O balancing the given redox reaction,
`aCr_2O_7^(2-) + bSO_3^(2-)(aq) +cH^+(aq) to 2a Cr^(3+)(aq)+b SO_4^(2-)(aq)+c/2 H_2O (l)`
the coefficients `a,b and c` are found to be, respectively -

A

`3, 8, 1`

B

`1, 8, 3`

C

`8, 1, 3`

D

`1, 3, 8`

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