Question

15. Reduction of the metal centre in aqueous permanganate ion
involves:
(LLT. 2011]
(a) 3 electrons in neutral medium
(b) 5 electrons in neutral medium
(c) 3 electrons in alkaline medium
(d) 5 electrons in acidic medium​

Answer 1

Answer:

The reactions of permanganate ion in different media are given below:

In acidic medium:

MnO

4

−

+8H

+

+5e

−

→Mn

2+

+2H

2

O

In neutral medium:

MnO

4

−

+2H

2

O+3e

−

→MnO

2

+4OH

−

In alkaline medium:

MnO

4

−

+e

−

→MnO

4

2−

Hence, number of electrons transfer in acidic, neutral and alkaline medium are 5,3 and 1 respectively.

Answer 2

Answer:

The reactions of permanganate ion in different media are given below: In acidic medium: In neutral medium: In alkaline medium: Hence, number of electrons transfer in acidic, neutral and alkaline medium are and  respectively.