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Magnetic Properties

Fusion of MnO...

Question

Fusion of $M n O_{2}$ with $K O H$ in presence of $O_{2}$ produces a salt W. An alkaline solution of W upon electrolytic oxidation yields another salt X. The manganese containing ions present in W and X, respectively, are Y and Z. Correct statement(s) is(are)

In an aqueous acidic solution, Y undergoes a disproportionation reaction to give Z and

M n O_{2}

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In both Y and

Z, π

- bonding occurs between the p-orbitals of oxygen and the d-orbitals of manganese

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Y is diamagnetic in nature while Z is paramagnetic

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Both Y and Z are coloured and attain a tetrahedral shape

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Solution

The correct option is D Both Y and Z are coloured and attain a tetrahedral shape
$M n O_{2} K O H / O_{2} - ----- \to K_{2} M n O_{4} W E l e c t r o l y t i c - ------ \to O x i d a t i o n K M n O_{4} X$
Accordingly $Y = M n O_{4}^{2 -}$
$Z = M n O_{4}^{-}$
a) $M n O_{4}^{2 -} a c i d i c m e d i u m - -------- \to M n O_{2} + M n O_{4}^{-}$
b) In both $M n O_{4}^{2 -}$ and $M n O_{4}^{-}$ , $π$ - bonding occurs between the p-orbitals of oxygen and the d-orbitals of manganese.
c) In $M n O_{4}^{2 -}$ the oxidation state of $M n$ is +6, so it possesses one valence electron and hence is paramagnetic in nature. While $M n O_{4}^{-}$ is daimagnetic as it does not have any unpaired electron.
d) Both $M n O_{4}^{2 -}$ and $M n O_{4}^{-}$ are coloured and attains tetrahedral shape.

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Fusion of $M n O_{2}$ with $K O H$ in presence of $O_{2}$ produces a salt W. An alkaline solution of W upon electrolytic oxidation yields another salt X. The manganese containing ions present in W and X, respectively, are Y and Z. Correct statement(s) is(are)