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 question regarding the product formed by the fusion of MnO₂ with KOH in the presence of the oxidizing agent KNO₃, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are:
- Manganese dioxide (MnO₂)
- Potassium hydroxide (KOH)
- Potassium nitrate (KNO₃)

### Step 2: Understand the Reaction Conditions
The reaction involves fusion, which typically means heating the reactants together. In this case, KNO₃ acts as an oxidizing agent, which will facilitate the oxidation of MnO₂.

### Step 3: Write the Reaction Equation
When MnO₂ reacts with KOH and KNO₃, the manganese in MnO₂ is oxidized. The expected reaction can be written as:
\[ 2 \text{MnO}_2 + 4 \text{KOH} + 2 \text{KNO}_3 \rightarrow 2 \text{K}_2\text{MnO}_4 + 2 \text{KNO}_2 + 2 \text{H}_2\text{O} \]

### Step 4: Identify the Product
From the balanced equation, we can see that the main product formed is potassium manganate (K₂MnO₄). This compound is known to be green in color.

### Step 5: Conclusion
Thus, the product formed by the fusion of MnO₂ with KOH in the presence of KNO₃ is potassium manganate (K₂MnO₄).

### Final Answer
The correct answer is **K₂MnO₄**.

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