Question

An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is B.M (Nearest integer)

Answer 1

$Mn{O}_4^{2-}\stackrel{H^{+}}{\to }Mn{O}_2+Mn{O}_4^{-}+H_{2}O$
$M{n}^{+7}=d^0$
Hence, magnetic moment = zero