D-And F-Block Elements Ques 32

Question: $ KMnO_4 $ in basic medium is reduced to

[Orissa JEE 2005]

Options:

A) $ K_2MnO_4 $

B) $ MnO_2 $

C) $ Mn{{(OH)}_2} $

D) $ M{{n}^{2+}} $

Show Answer

Answer:

Correct Answer: B

Solution:

$ KMnO_4 $ is first reduced to manganate and then to insoluble manganese dioxide. Colour changes first from purple to green and finally becomes colourless.

$ 2KMnO_7+2KOH\to 2K_2MnO_4+H_2O+O $

$ 2K_2MnO_4+2H_2O\to 2MnO_2+4KOH+2O $

$ 2KMnO_2+H_2O\xrightarrow{alkaline}2MnO_2+2KOH+3[O] $



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