Chemistry-Oxidation Number
NEET Chemistry Oxidation Number MCQ Question
Type: MCQ-numerical-Hard-Class 11
In the redox reaction: 2MnO4⁻ + Br⁻ + H2O → 2MnO2 + BrO3⁻ + 2OH⁻, what is the change in the oxidation number of manganese (Mn) when MnO4⁻ is reduced to MnO2?
A
Decrease by 3 units
B
Increase by 2 units
C
Decrease by 2 units
D
Increase by 3 units
Correct Answer
Option A
Detailed Explanation
The oxidation number of Mn in MnO4⁻ is +7 and in MnO2 is +4. Thus, the decrease in oxidation number is 7 - 4 = 3 units.
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