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Fusion of MnO2 with KOH in the presence ...

Fusion of `MnO_2` with KOH in the presence of `O_2` produces a salt W. 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 aqueous acidic solution, Y undergoes disproportionation reaction to give Z and `MnO_(2)`

B

Both Y and Z are coloured and have tetrahedral shape

C

Y is diamagnetic in nature while Z is paramagnetic

D

In both Y and Z, `pi`- bonding occurs between p-orbitals of oxygen and d-orbitals of manganese

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