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Q. Acidified $KMnO_{4}$ solution is decolourized by

NTA AbhyasNTA Abhyas 2022

Solution:

Acidified $KMnO_{4}$ solution is decolourized by Mohr's salt and Mohr's salt is $FeSO _4\left( NH _4\right)_2 SO _4 \cdot 6 H _2 O$
$MnO_{4}^{-}+8H^{+}+5e^{-} \rightarrow Mn^{2 +}+4H_{2}O$
$5Fe^{2 +} \rightarrow 5Fe^{3 +}+5e^{-}$
$MnO_{4}^{-}+8H^{+}+5Fe^{2 +} \rightarrow \underset{\left(\right. C o l o u r l e s s \left.\right)}{M n^{2 +}}+4H_{2}O+5Fe^{3 +}$