D-And F-Block Elements Ques 1
Question: Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively
[MP PMT 1997]
Options:
A) $ MnO_2,MnO_2,M{{n}^{2+}} $
B) $ MnO_4^{2-},M{{n}^{3+}},M{{n}^{2+}} $
C) $ MnO_2,MnO_4^{2-},M{{n}^{3+}} $
D) $ MnO,MnO_4,M{{n}^{2+}} $
Show Answer
Answer:
Correct Answer: A
Solution:
$ MnO_2,MnO_2,M{{n}^{2+}} $
In neutral medium: $ 2KMnO_4+3MnSO_4+2H_2O,\to $ $ K_2SO_4+2H_2SO_4+5MnO_2 $
In alkaline medium: $ 2KMnO_4+H_2O,\to ,2MnO_2+2KOH+3O $
In acidic medium: $ 2KMnO_4+3H_2SO_4,\to K_2SO_4+\overset{+2}{\mathop{2MnSO_4}}, $ $ +5H_2O+5O $
