`KMnO_(4)` is powerful oxidant where it converts into

Options

A. `MnO_(4)^(2-)`
B. `MnO_(2)`
C. `Mn^(2+)`
D. `Mn^(3+)`

Answer

To solve the question regarding the conversion of KMnO₄ (potassium permanganate) as a powerful oxidant, we will analyze its behavior in different mediums: acidic, alkaline, and neutral.

### Step-by-Step Solution:

1. **Understanding KMnO₄ as an Oxidizing Agent**:
- KMnO₄ contains manganese in the +7 oxidation state (MnO₄⁻). It is known for its strong oxidizing properties.

2. **Reaction in Acidic Medium**:
- When KMnO₄ is added to an acidic medium (for example, sulfuric acid), it undergoes reduction.
- The reaction can be represented as:
\[ 2KMnO₄ + 3H₂SO₄ \rightarrow K₂SO₄ + 2MnSO₄ + 3H₂O + 5O \]
- In this reaction, KMnO₄ is reduced to Mn²⁺ (manganese in +2 oxidation state).

3. **Reaction in Alkaline Medium**:
- In a strongly alkaline medium (for example, with potassium hydroxide), KMnO₄ reacts to form manganate ions (MnO₄²⁻).
- The reaction can be represented as:
\[ 2KMnO₄ + 2KOH \rightarrow 2K₂MnO₄ + H₂O \]
- Here, KMnO₄ is converted to K₂MnO₄, which contains manganese in the +6 oxidation state (MnO₄²⁻).

4. **Reaction in Neutral Medium**:
- In a neutral medium, KMnO₄ can also react with water, accepting electrons.
- The reaction can be represented as:
\[ 2KMnO₄ + 4H₂O \rightarrow 2MnO₂ + 4OH⁻ + 2K⁺ \]
- In this case, KMnO₄ is reduced to MnO₂ (manganese in +4 oxidation state).

5. **Summary of Conversions**:
- In acidic medium: KMnO₄ → Mn²⁺
- In alkaline medium: KMnO₄ → MnO₄²⁻
- In neutral medium: KMnO₄ → MnO₂

### Final Conclusion:
KMnO₄ acts as a powerful oxidizing agent and can convert into different manganese species depending on the medium:
- In acidic medium, it converts to Mn²⁺.
- In strongly alkaline medium, it converts to MnO₄²⁻.
- In neutral medium, it converts to MnO₂.