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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 shape
MnO2KOH/O2−−−−−K2MnO4WElectrolytic−−−−−−OxidationKMnO4X
Accordingly Y=MnO24
Z=MnO4
a) MnO24acidic medium−−−−−−−−MnO2+MnO4
b) In both MnO24 and MnO4, π - bonding occurs between the p-orbitals of oxygen and the d-orbitals of manganese.
c) In MnO24 the oxidation state of Mn is +6, so it possesses one valence electron and hence is paramagnetic in nature. While MnO4 is daimagnetic as it does not have any unpaired electron.
d) Both MnO24 and MnO4 are coloured and attains tetrahedral shape.



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