Potassium permanganate on heating at 573K forms potassium manganate.
+7
KMnO
4
permanganate(Diamagnetic)
573K
───▶
K2
+6
MnO4
Potassium manganate Paramagnetic)
+MnO2+O2
Both potassium permanganate and potassium manganate are tetrahedral. Manganese has four sigma bonds forming tetrahedral structure.
KMnO4;+1+x−8=0 x=+7 K2MnO4;+2+x−8=0 x=+6 So, Mn is present in +7 oxidation state in KMnO4 and +6 oxidation state in K2MnO4. 25Mn=[Ar]4s23d5 Mn+7=[Ar]4s03d0 (Diamagnetic) Mn+6=[Ar]4s1 (Paramagnetic) So, potassium permanganate is diamagnetic and potassium manganate is paramagnetic. Statement I is true but statement II is false.