In alkaline medium, the reduction of permanganate anion involves a gain of electrons.

Question

In alkaline medium, the reduction of permanganate anion involves a gain of  electrons.

Canvas Classes · Accepted Answer

Step 1 — Half-reaction of  in alkaline medium:

In alkaline medium,  is reduced to :

Step 2 — Verify oxidation state change:
- Mn in : 
- Mn in : 
- Change:  = gain of 3 electrons ✓

Note: Compare with other media:
- Acidic medium:  (gain of 5e⁻)
- Neutral medium:  (gain of 3e⁻)
- Alkaline medium:  (gain of 1e⁻) — but the standard alkaline product is

Answer: 3

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