Ncert Exercises & Solutions

A solution of $K M n O_{4}$ on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out?

NEETprep Answer: Oxidising behaviour of

K M n O_{4}

depends on pH of the solution.

In acidic medium (pH < 7)

M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O

C o l o u r l e s s

In alkaline medium (pH > 7)

M n O_{4}^{-} + e^{-} \to M n O_{4}^{2 -}

(G r e e n)

In neutral medium (pH = 7)

M n O_{4}^{-} + 2 H_{2} O + 3 e^{-} \to M n O_{2} + 4 O H^{-}

(B r o w n p p t)

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions