Question

In an oxidation-reduction reaction, what happens to the oxidation state of the central atom in \( \text{MnO}_4^- \) when it is reduced to \( \text{Mn}^{2+} \)?

• A. The oxidation state increases from +7 to +2.
• B. The oxidation state decreases from +7 to +2.
• C. The oxidation state remains the same.
• D. The oxidation state increases from +2 to +7.

Hint:

When solving oxidation-reduction problems, always determine the oxidation states of the elements involved before and after the reaction.

Answer 1

The Correct Option is B

In the compound \( \text{MnO}_4^- \), the oxidation state of manganese (Mn) is +7. When \( \text{MnO}_4^- \) is reduced to \( \text{Mn}^{2+} \), the oxidation state of manganese decreases to +2. 

This is a reduction process, as the manganese atom gains electrons, reducing its oxidation state.