The product formed by the fusion of `MnO_2` with KHO in the presence of an oxidising agent, `KNO_3` is

Options

A. `K_2MnO_4`
B. `KMnO_4`
C. `Mn_2O_3`
D. `K_3MnO_4`

Answer

To solve the problem, we need to determine the product formed by the fusion of manganese dioxide (MnO₂) with potassium hydroxide (KOH) in the presence of an oxidizing agent, potassium nitrate (KNO₃).

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this reaction are manganese dioxide (MnO₂), potassium hydroxide (KOH), and potassium nitrate (KNO₃).

2. **Understand the Fusion Process**: Fusion in this context refers to the heating of the reactants together. When MnO₂ and KOH are heated, they react to form a manganese compound.

3. **Determine the Role of KNO₃**: Potassium nitrate acts as an oxidizing agent in this reaction. It helps in the oxidation of MnO₂, which is crucial for the formation of the final product.

4. **Write the Reaction**: The fusion of MnO₂ with KOH in the presence of KNO₃ can be represented by the following balanced chemical equation:
\[ 2 \text{MnO}_2 + 4 \text{KOH} + \text{O}_2 \rightarrow 2 \text{K}_2\text{MnO}_4 + 2 \text{H}_2\text{O} \]
Here, the product formed is potassium manganate (K₂MnO₄).

5. **Identify the Product**: The product K₂MnO₄ is known as potassium manganate, which is a green-colored compound.

6. **Select the Correct Option**: Given the options:
- Option 1: K₂MnO₄
- Option 2: KMnO₄
- Option 3: KMnO₃
- Option 4: K₃MnO₄

The correct answer is **Option 1: K₂MnO₄**.

### Final Answer:
The product formed by the fusion of MnO₂ with KOH in the presence of an oxidizing agent KNO₃ is **K₂MnO₄**.