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2MnO4- + bI- + cH2O xI2 + yMnO2 + zOH- If the above equation is balanced with integer coefficients, the value of z is .
8
Reduction: +7MnO4- + 2H2O + 3e- +4MnO2 + 4OH- ] × 2
Oxidation: 2I- I2 + 2e- ] × 3
Net: 2MnO4- + 6I- + 4H2O 3I2 + 2MnO2 + 8OH-
∴ b = 6, c = 4, x = 3, y = 2, z = 8
Answer: 8
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