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Question

# Fusion of MnO2 with KOH in presence of O2 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)

A
In an aqueous acidic solution, Y undergoes a disproportionation reaction to give Z and MnO2
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B
In both Y and Z,π - bonding occurs between the p-orbitals of oxygen and the d-orbitals of manganese
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C
Y is diamagnetic in nature while Z is paramagnetic
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D
Both Y and Z are coloured and attain a tetrahedral shape
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Solution

## The correct options are A In an aqueous acidic solution, Y undergoes a disproportionation reaction to give Z and MnO2 B In both Y and Z,π - bonding occurs between the p-orbitals of oxygen and the d-orbitals of manganese D Both Y and Z are coloured and attain a tetrahedral shapeMnO2KOH/O2−−−−−−→K2MnO4WElectrolytic−−−−−−−→OxidationKMnO4X Accordingly Y=MnO2−4 Z=MnO−4 a) MnO2−4acidic medium−−−−−−−−−→MnO2+MnO−4 b) In both MnO2−4 and MnO−4, π - bonding occurs between the p-orbitals of oxygen and the d-orbitals of manganese. c) In MnO2−4 the oxidation state of Mn is +6, so it possesses one valence electron and hence is paramagnetic in nature. While MnO−4 is daimagnetic as it does not have any unpaired electron. d) Both MnO2−4 and MnO−4 are coloured and attains tetrahedral shape.

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