Question

Arrange the following in increasing order of oxidation states of Mn, K₂MnO₄ , MnO₂ , KMnO₄

Answer 1

Oxidation state of Mn in K₂MnO₄
1(2) + x + 4 (-2) = 0
2 + x – 8 = 0
x = 8 – 2
x = +6
Oxidation state of Mn in MnO₂
x + 2 (-2) =0
x – 4 = 0
x= +4
Oxidation state of Mn in KMnO₄
1 + x + 4 (-2) = 0
1 + x – 8 = 0
x – 7 = 0
x = + 7
∴ Increasing order of oxidation states of Mn,
MnO₂ < K₂MnO₄ < KMnO₄