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In the redox reaction: a*MnO4⁻ + b*I⁻ + c*H⁺ -> d*Mn²+ + e*I2 + f*H2O (balanced), find the value of c/d.
- 1.3
- 1.2
- 8
- 5
Correct answer: 8
Solution
Reduction half-reaction: MnO4⁻ + 8H⁺ + 5e⁻ -> Mn²+ + 4H2O (multiply by 2). Oxidation half-reaction: 2I⁻ -> I2 + 2e⁻ (multiply by 5). Overall: 2MnO4⁻ + 10I⁻ + 16H⁺ -> 2Mn²+ + 5I2 + 8H2O. Comparing with the given form: a=2, b=10, c=16, d=2, e=5, f=8. c/d = 16/2 = 8.
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