Q58. Consider the following reaction $\mathrm { MnO } _ { 2 } + \mathrm { KOH } + \mathrm { O } _ { 2 } \rightarrow \mathrm {~A} + \mathrm { H } _ { 2 } \mathrm { O }$. Product ' A ' in neutral or acidic medium disproportionate to give products ' B ' and ' C ' along with water. The sum of spin-only magnetic moment values of B and C is BM . (nearest integer) (Given atomic number of Mn is 25 )