`KMnO_4` is prepared from the mineral pyrolusite, `MnO_2` (deep purple colour). It acts as an oxidising agent in the neutral, alkaline as well as acidic medium in acidic medium it is used in volumetric analysis for estimation of `Fe^(2+)`, `Cr_2O_4^(2-)` salts etc. The titrations are carried out in presence of `H_2SO_4`. However, before using it as a titrant, it is first standardised with standard oxalic acid solution or Mohr's salt solution . In one of the experiments on titration 26.8g of dry pure sodium oxalate `(Mw=123gmol^-1)` was dissolved in 1L of distilled water and then 100 mL of `2MH_2SO_4` were added. The solution was cooled. Now to this solution `0.1MKMnO_4` solution was added till a very faint pink colour persisted.
Q. When pyrolusite is fused with `KOH` and `KClO_3`, we get

Options

A. `KMnO_4`
B. `K_2MnO_4`
C. both `KMnO_4` and `K_2MnO_4`
D. None of these

Explanation

To solve the question regarding the products formed when pyrolusite (MnO₂) is fused with KOH and KClO₃, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this reaction are pyrolusite (MnO₂), potassium hydroxide (KOH), and potassium chlorate (KClO₃).

2. **Understand the Reaction Conditions**: When MnO₂ is fused with KOH and KClO₃, it undergoes a chemical reaction that produces different manganese compounds.

3. **Write the Reaction**: The fusion of these compounds can be represented by the following reactions:
- When 2 moles of MnO₂ react with 2 moles of KOH and 1 mole of KClO₃, the products formed are:
\[ 2 \text{MnO}_2 + 2 \text{KOH} + \text{KClO}_3 \rightarrow 2 \text{KMnO}_4 + \text{KCl} + 2 \text{H}_2\text{O} \]
- Alternatively, when 3 moles of MnO₂ react with 6 moles of KOH and 1 mole of KClO₃, the products formed are:
\[ 3 \text{MnO}_2 + 6 \text{KOH} + \text{KClO}_3 \rightarrow 3 \text{K}_2\text{MnO}_4 + \text{KCl} + 3 \text{H}_2\text{O} \]

4. **Determine the Products**: From the reactions above, we can see that both potassium permanganate (KMnO₄) and potassium manganate (K₂MnO₄) can be formed depending on the stoichiometry of the reactants used.

5. **Conclusion**: Therefore, the final answer to the question is that both KMnO₄ and K₂MnO₄ can be produced when pyrolusite is fused with KOH and KClO₃.

### Final Answer:
The correct answer is **both KMnO₄ and K₂MnO₄** (Option 3).