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Question 700009
JEE Chemistry · Medium

Redox Reactions: Balancing MCQ

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BalancingMediumQuestion 700009

Question

In the reaction Cr₂O₇²⁻ + Fe²⁺ → Cr³⁺ + Fe³⁺ (acidic medium), ratio of Cr₂O₇²⁻ to Fe²⁺ is:
  1. A
    1:6
    Correct
  2. B
    1:3
  3. C
    2:3
  4. D
    3:1

Correct answer

1:6

Explanation

Each Cr₂O₇²⁻ contains 2 Cr atoms changing from +6 to +3: n-factor = 2×3 = 6. Each Fe²⁺ has n-factor = 1. By equivalents: 6 Fe²⁺ per Cr₂O₇²⁻. Ratio = 1:6.

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