On balancing the given redox reaction, a Cr2O7 2- + b SO3 2- (aq) + c H+ (aq) 2a Cr 3+ (aq) + b SO4 2- (aq) + c 2 H2O (l) the coefficients a, b and c are found to be, respectively-

1. A. 1, 3, 8
2. B. 3, 8, 1
3. C. 1, 8, 3
4. D. 8, 1, 3

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