Verified Solution • 2025–26 Session moderate

QNEET-2023-Ch-220: NEET 2023 Chemistry - Class 11 NEET-2023-Ch-220 Solution: On balancing the given redox reaction \(aCr_2O_7^{2-} +…

On balancing the given redox reaction aCr2O72−+bSO32−(aq)+cH+(aq)→2aCr3+(aq)+bSO42−(aq)+c2H2O(l)aCr_2O_7^{2-} + bSO_3^{2-}(aq) + cH^+(aq) \rightarrow 2aCr^{3+}(aq) + bSO_4^{2-}(aq) + \frac{c}{2}H_2O(l) the coefficients a b and c are found to be respectively - 38 1 18 3 81 3 138

Multiple Choice Options

  • A 3, 8, 1
  • B 1, 8, 3
  • C 8, 1, 3
  • D 1, 3, 8

Step-by-Step Verified Solution

Reaction has to be balanced in acidic medium 'O' atoms are balanced by adding H 2 O and then H -atom is balanced by adding H + ions and charge is balanced by e _ . Oxidation: SO 3 2 _ + H 2 O _ SO 4 2 _ + 2 H + + 2 e _ ] _ 3 Reduction: Cr 2 O 7 2 _ + 14 H + + 6 e _ _ 2 Cr 3 + + 7 H 2 O Cr 2 O 7 2 _ + 3 SO 3 2 _ + 8 H _ _ 2 Cr 3 + + 3 SO 4 2 _ + 4 H 2 O a = 1 b = 3 c = 8

Related Learning Resources & Exam Preparation

NEET PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring