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JEE Advanced 2019Paper 1

Exam: JEE Advanced
Year: 2019
Paper: Paper 1
Subject: Chemistry
Chapter: d and f Block Elements

JEE Advanced 2019 · Paper 1 · Chemistry · d and f Block Elements

Fusion of Mn O _ 2 with KOH in presence of O _ 2 produces a salt W...

Fusion of

Mn{O}_{2}

with

KOH

in 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) Fusion of Mn O _ 2 with KOH in presence of O _ 2 produces a salt W . Alkaline solution of W upon electrolytic oxidation

Fusion of Mn O _ 2 with KOH in presence of O _ 2 produces a salt W . Alkaline solution of W upon electrolytic oxidation

Options

A $Y$ is diamagnetic in nature while $Z$ is paramagnetic
BBoth $Y$ and $Z$ are coloured and have tetrahedral shape
CIn both $Y$ and $Z,$ $\pi$ -bonding occurs between $p$ -orbitals of oxygen and $d$ -orbitals of manganese.
DIn aqueous acidic solution, $Y$ undergoes disproportionation reaction to give $Z$ and ${MnO}_{2} .$

Correct answer

B. Both $Y$ and $Z$ are coloured and have tetrahedral shape

Step-by-step solution

{\text{M}}_{\text{n}}{\text{O}}_{\text{2}} + 2\text{KOH} + \dfrac{1}{2}{\text{O}}_{\text{2}}\overset{\Delta}{\to}\mathop{{\text{K}}_{\text{2}}{\text{M}}_{\text{n}}{\text{O}}_{4}}_{( \text{W} )} + {\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-}}

Fusion of Mn O _ 2 with KOH in presence of O _ 2 produces a salt W . Alkaline solution of W upon electrolytic oxidation

Purple coloured and tetrahedra shape

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