Question Detail
Question
In MnO₄⁻, the oxidation number of Mn is
Correct Answer
Option D is the correct answer.
Detailed Explanation
Oxygen usually has oxidation number -2. Total charge = -1. Let x + 4(-2) = -1 → x - 8 = -1 → x = +7.
Hint
Solve for Mn using the overall charge.