In the conversion of KMnO₄ (Mn oxidation state = +7) to K₂MnO₄ (Mn oxidation state = +6), the change in oxidation number is 1. Therefore, the equivalent weight = Molecular weight / change in O.N. = M/1 = M. [cite: 493, 494, 501, 502, 503, 504, 505, 506, 507]