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.
