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.



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