First slide

Potassium permanganate

Question

Which one of the following ions exhibits d-d transition and paramagnetism as well?

Moderate

A

${CrO}_{4}^{2 -}$
B

${Cr}_{2} O_{7}^{2 -}$
C

${MnO}_{4}^{-}$
D

${MnO}_{4}^{2 -}$

Solution

$\begin{array}{l} In {CrO}_{4}^{2 -} & {Cr}^{+ 6} & (n = 0) & diamagnetic \end{array} \begin{array}{l} In {Cr}_{2} {O_{7}}^{2 -} & {Cr}^{+ 6} & (n = 0) & diamagnetic \end{array} \begin{array}{l} In {MnO}_{4}^{-} & {Mn}^{+ 7} (n = 0) & diamagnetic \end{array} In {MnO}_{4}^{2 -} {Mn}^{+ 6} (n = 1) paramagnetic$
$In {MnO}_{4}^{2 -}, oneunpairedelectron (n) ispresentin d - orbital so, d - d transitionispossible .$

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