Write ionic equation showing `KMnO_4` acting as an oxidising agent in acidic medium.

Explanation

To write the ionic equation showing \( KMnO_4 \) acting as an oxidizing agent in acidic medium, we need to follow these steps:

### Step 1: Identify the species involved
In acidic medium, potassium permanganate (\( KMnO_4 \)) dissociates to give \( MnO_4^- \) ions. The manganese in \( KMnO_4 \) is in the +7 oxidation state.

### Step 2: Determine the reduction half-reaction
As an oxidizing agent, \( KMnO_4 \) will be reduced. The manganese will be reduced from +7 to +2 in acidic medium. The half-reaction can be written as:
\[
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