Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
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

  1. A8 , 1 , 3
  2. B1 , 3 , 8
  3. C3 , 8 , 1
  4. 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

Practice Redox Reactions on Quantrex Academy →

More from Redox Reactions

Calculate the oxidation number of sulfur in H ₂ SO ₄ . 2026Consider the following compounds : K O ₂, H ₂ O ₂ and H ₂ S O ₄ The oxidation state of the underlined elements in them are respectively, 2026What is the oxidation number of phosphorus in Mg ₂ P ₂ O ₇ ? 2026Identify oxidant and reductant, respectively, in the following reaction: Zn (s) + Cu ²⁺(aq) Zn ²⁺(aq) + Cu (s) 2026Which of the following is true regarding oxidation? 2026In a reaction, 2 H ₂ S + SO ₂ 2 H ₂ O + 3 S Identify the substance oxidized. 2026Predict the oxidation number of of 'C' in K ₂ C ₂ O ₄ and in CH ₂ Cl ₂ . 2026The oxidation process involves 2026 Full Redox Reactions list All NEET PYQs