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



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