D-And F-Block Elements Ques 5
Question: When $ KMnO_4 $ reacts with acidified $ FeSO_4 $
[MP PET 1996]
Options:
A) Only $ FeSO_4 $ is oxidised
B) Only $ KMnO_4 $ is oxidised
C) $ FeSO_4 $ is oxidised $ KMnO_4 $ and is reduced
D) None of these
Show Answer
Answer:
Correct Answer: C
Solution:
$ FeSO_4 $ is oxidised and $ KMnO_4 $ is reduced.
$ 2KMnO_4+3H_2SO_4,\to ,K_2SO_4+2MnSO_4 $
$ [2FeSO_4+H_2SO_4,\to ,Fe_2{{(SO_4)}_3}+2H]\times 5 $
$ [2H+[O],\to ,H_2O]\times 5 $
$ 2KMnO_4+8H_2SO_4+10FeSO_4,\to $ $ K_2SO_4+2MnSO_4+5Fe_2{{(SO_4)}_3}+8H_2O $
In this reaction oxidation state of $ Mn $ is changing from +7 to +2 while oxidation state of $ Fe $ is changing from +2 to +3.
