Some Basic Concepts Of Chemistry Question 228
Question: Acidified potassium permanganate solution is decolourised by [MNR 1984]
Options:
A) Bleaching powder
B) White vitriol
C) Mohr’s salt
D) Microcosmic salt
Show Answer
Answer:
Correct Answer: C
Solution:
$ 2KMnO _4+3H _2SO _4\to $
$ K _2SO _4+2MnSO _4+3H _2O+[O] $
$ \underset{[\text{ Mohr}-\text{salt }]}{\mathop{2FeSO _4+}},H _2SO _4+[O]\to $ $ Fe _2{{(SO _4)}_3}+H _2O]\times 5 $
$ 2KMnO _4+10FeSO _4+8H _2SO _4\to $
$ K _2SO _4+2MnSO _4+5Fe _2{{(SO _4)}_3}+8H _2O $
Mohr-salt reducing agent $ KMnO _4/{H^{+}}\to $ oxidising agent
