Question

In the preparation of KMnO4 pyrolusite (MnO2)is
first converted to potassium manganate (K2MnO)4
In this conversion, the oxidation state of manganese
changes from
a) +1 to +3
b) +2 to +4
c) +3 to +5
d) +4 to +6​

Answer 1

The correct answer to your question is

d) +4 to +6

Hope it helps.

Answer 2

Answer:

Oxidation state of Mn in (MnO2) is + 4 and

Oxidation state of Mn in (K2MnO4) 2 is + 6

answer : D) +4 to +6