Potassium permanganate is prepared by fusing pyrolusite with caustic potash in the presence of air or some oxidising agent which gives a green mass. The green mass is then extracted with water and treated with a current of `Cl_2` to form potassium permanganate. In the laboratory, it is prepared by oxidising a manganese (II) salt by peroxosulphate. It acts as an oxidising agent in neutral, alkaline or acidic solutions.
Name two oxidising agents which can be used in place of air for the above reaction.

Explanation

To answer the question regarding the oxidizing agents that can be used in place of air for the preparation of potassium permanganate from pyrolusite and caustic potash, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- Potassium permanganate (KMnO4) is synthesized by fusing pyrolusite (MnO2) with caustic potash (KOH) in the presence of an oxidizing agent. The reaction produces potassium manganate (K2MnO4), which is a green mass.

2. **Identifying the Role of Air**:
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