Chemistry_JEE_Advanced_2019_S1 - Competishun – Live JEE & NEET Courses and Exam Prep

JEE Advance 2019

Paper 1

Multiple correct answers - Select all that apply

Question

Fusion of $\mathrm{MnO}_2$ with KOH in presence of $\mathrm{O}_2$ produces a salt $\mathbf{W}$. Alkaline solution of $\mathbf{W}$ upon eletrolytic oxidation yields another salt $\mathbf{X}$. The manganese containing ions present in $\mathbf{W}$ and $\mathbf{X}$, respectively, are $\mathbf{Y}$ and $\mathbf{Z}$. Correct statement(s) is (are)

Select ALL correct options:

$\mathbf{Y}$ is diamagnetic in nature while $\mathbf{Z}$ is paramagnetic

Both $\mathbf{Y}$ and $\mathbf{Z}$ are coloured and have tetrahedral shape

In both $\mathbf{Y}$ and $\mathbf{Z}$, $\pi$-bonding occurs between p-orbitals of oxygen and d-orbitals of manganese.

In aqueous acidic solution, $\mathbf{Y}$ undergoes disproportionation reaction to give $\mathbf{Z}$ and $\mathrm{MnO}_2$.

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

⚠ Partially correct. Some answers are missing.

Solution