D-And F-Block Elements Ques 38

Question: Acidified potassium permanganate solution is decolourised by

[MNR 1984]

Options:

A) Bleaching powder

B) White vitriol

C) Mohr’s salt

D) Microcosmic salt

E) Laughing gas

Show Answer

Answer:

Correct Answer: C

Solution:

Mohr’s salt. $ 2KMnO_4+8H_2SO_4+10FeSO_4,\to $ $ K_2SO_4+2MnSO_4+5Fe_2{{(SO_4)}_3}+8H_2O $ Mohr’s salt decolourises

$ KMnO_4 $ by reducing $ M{{n}^{+7}} $ ions to $ M{{n}^{+2}} $ ions.



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