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  4. Acidified potassium permanganate solution is decolourised by

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Q. Acidified potassium permanganate solution is decolourised by

The d-and f-Block Elements

Solution:

Mohr’s salt.
$2KMnO_4 + 8H_2SO_4 + 10 FeSO_4 \to K_2+SO_4+2MnSO_4 + 5Fe_2\left(SO_{4}\right)_{3} + 8H_2O$
Mohr’s salt decolourises $KMnO_4$ by reducing $Mn^{+7}$ ions to $Mn^{+2}$ ions.