Fusion of M n O 2 with K O H in presence of O 2 produces a salt W . Alkaline solution of W upon electrolytic…

1. $\mathrm{Y}$ is diamagnetic in nature while $\mathrm{Z}$ is paramagnetic
2. Both $\mathrm{Y}$ and $\mathrm{Z}$ are coloured and have tetrahedral shape
3. In both $\mathrm{Y}$ and $\mathrm{Z},$ $\mathrm{\pi }$ -bonding occurs between $\mathrm{p}$ -orbitals of oxygen and $\mathrm{d}$ -orbitals of manganese.
4. In aqueous acidic solution, $\mathrm{Y}$ undergoes disproportionation reaction to give $\mathrm{Z}$ and ${\mathrm{M}\mathrm{n}\mathrm{O}}_2.$

Solution

${\text{M}}_{\text{n}}{\text{O}}_{\text{2}}+2\text{KOH}+\frac{1}{2}{\text{O}}_{\text{2}}\stackrel{\Delta }{\to }\underset{\left(\text{W}\right)}{{\text{K}}_{\text{2}}{\text{M}}_{\text{n}}{\text{O}}_4}+{\text{H}}_{\text{2}}\text{O}$
Oxidation state $+6$
Paramagnetic and green colored salt
$\to$ shape : Tetrahedra of anion ${\text{M}}_{\text{n}}{\text{O}}_{\text{4}}^{\text{2-}}$

Purple coloured and tetrahedra shape

Asked in: JEE Advanced 2019 (Paper 1)

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