When `MnO_(2)` is fused with `KOH` in air, it gives

Options

A. `K_(2)MnO_(4)`
B. `FeC_(2)O_(4)`
C. `Fe_(2)(C_(2)O_(4))_(3)`
D. `Fe_(2)(SO_(4))_(3)`

Answer

To solve the question, "When MnO₂ is fused with KOH in air, it gives," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this reaction are manganese dioxide (MnO₂) and potassium hydroxide (KOH).

2. **Consider the Conditions**:
- The reaction occurs in the presence of air, which provides oxygen (O₂).

3. **Write the Reaction**:
- When MnO₂ is fused with KOH in the presence of air, the reaction can be represented as:
\[ \text{MnO}_2 + 4 \text{KOH} + O_2 \rightarrow 2 \text{K}_2\text{MnO}_4 + 2 \text{H}_2\text{O} \]

4. **Identify the Products**:
- The products of this reaction are potassium manganate (K₂MnO₄) and water (H₂O).

5. **Balancing the Equation**:
- The balanced equation shows that 1 mole of MnO₂ reacts with 4 moles of KOH and 1 mole of O₂ to produce 2 moles of K₂MnO₄ and 2 moles of H₂O.

6. **Color of the Product**:
- Potassium manganate (K₂MnO₄) is known to have a green color.

7. **Final Answer**:
- Therefore, when MnO₂ is fused with KOH in air, it gives potassium manganate (K₂MnO₄) and water (H₂O).