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When we pass carbon dioxide gas through a green coloured solution of potassium manganate, the colour of solution changes to purple and a brown coloured solid gets precipitated. The green colour of potassium manganate solution also becomes purple when it is subjected to electrolysis using iron electrodes.
In the brown solid precipitate, oxidation state of Mn is

A

`+2`

B

`+4`

C

`+6`

D

`+7`

Text Solution

Verified by Experts

The correct Answer is:
B
The brown solid is `MnO_2`.
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