NEET2023ChemistryRedox ReactionsActual
On balancing the given redox reaction a Cr 2 O 7 2 - + bSO 3 2 - aq + cH + aq → 2 aCr 3 + aq + bSO 4 2 - aq + c 2 H 2 O l The coefficients a , b , c   are found to be respectively
Options
- A8 , 1 , 3
- B1 , 3 , 8
- C3 , 8 , 1
- D1 , 8 , 3
Correct answer
B. 1 , 3 , 8
Step-by-step solution
Reduction Half reaction : Cr 2 O 7 2 − + 6 e - → 2 Cr 3 + Oxidation Half reaction : SO 3 2 − → SO 4 2 − + 2 e - × 3 Overall reaction : Cr 2 O 7 2 − + 3 SO 3 2 − → 2 Cr 3 + + 3 SO 4 2 - To balance ‘ O ’   atoms, adding H 2 O on LHS Cr 2 O 7 2 − + 3 SO 3 2 − → 2 Cr 3 + + 3 SO 4 2 - + 4 H 2 O To balance ‘ H ’ atoms, adding H + on RHS Cr 2 O 7 2 − + 3 SO 3 2 − + 8 H + → 2 Cr 3 + + 3 SO 4 2 - + 4 H 2 O T