While $$\mathrm{Fe}^{3+}$$ is stable, $$\mathrm{Mn}^{3+}$$ is not stable in acid solution because
- A$$\mathrm{O}_{2}$$ oxidises $$\mathrm{Mn}^{2+}$$ to $$\mathrm{Mn}^{3+}$$
- B$$\mathrm{O}_{2}$$ oxidises both $$\mathrm{Mn}^{2+}$$ and $$\mathrm{Fe}^{2+}$$ to $$\mathrm{Fe}^{3+}$$
- C$$\mathrm{Fe}^{3+}$$ oxidises $$\mathrm{H}_{2} \mathrm{O}$$ to $$\mathrm{O}_{2}$$
- D$$\mathrm{Mn}^{3+}$$ oxidises $$\mathrm{H}_{2} \mathrm{O}$$ to $$\mathrm{O}_{2}$$
✓ Correct answer: D
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