Embibe Experts Solutions for Chapter: The d- and f-block Elements, Exercise 3: Level 3

A compound $\mathrm{X}$ reacts with rubidium chloride in the presence of an acid to give orange-red fumes of $\mathrm{Y}$. Then $\mathrm{X}$ and $\mathrm{Y}$ respectively, are:

 $\mathrm{A}$ and $\mathrm{B}$ in the following reaction, respectively, are:

${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+\mathrm{HCl} \to \mathrm{KCl}+\mathrm{A}+\mathrm{B}+{\mathrm{H}}_2\mathrm{O}$

Which of the following arrangements does not represent the correct order of the property stated against it?

Which of the following is correct about the basic strength of hydroxide?

Which of the following reactions are disproportionation reactions?

$\left(\mathrm{i}\right)$ ${\mathrm{Cu}}^{+}⟶{\mathrm{Cu}}^{2+}+\mathrm{Cu}$
$\left(\mathrm{ii}\right)$ $3{\mathrm{MnO}}_4^{-}+4{\mathrm{H}}^{+}⟶2{\mathrm{MnO}}_4^{-}+{\mathrm{MnO}}_2+2{\mathrm{H}}_2\mathrm{O}$
$\left(\mathrm{iii}\right)$ $2{\mathrm{KMnO}}_4⟶{\mathrm{K}}_2{\mathrm{MnO}}_4+{\mathrm{MnO}}_2+{\mathrm{O}}_2$
$\left(\mathrm{iv}\right)$ $2{\mathrm{MnO}}_4^{-}+3{\mathrm{Mn}}^{2+}+2{\mathrm{H}}_2\mathrm{O}⟶5{\mathrm{MnO}}_2+4{\mathrm{H}}^{+}$

Determine the oxidation state of chromium in the final product formed by the reaction between $\mathrm{KI}$ and acidified potassium dichromate solution.

A$0.5-\mathrm{g}$ sample containing ${\mathrm{MnO}}_2$ is treated with $\mathrm{HCl}$, liberating ${\mathrm{Cl}}_2$. The ${\mathrm{Cl}}_2$ is passed into a solution of $\mathrm{KI}$ and $30.0 {\mathrm{cm}}^3$ of $0.1 \mathrm{M} {\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ is required to titrate the liberated iodine. Calculate the percentage of ${\mathrm{MnO}}_2$ in the sample.

[Answer has to be given up to one place of decimal]

Out of the $5$ different products formed in the following reaction, how many contains $\mathrm{O}$-atom(s)?

${\mathrm{KMnO}}_4 + {\mathrm{Na}}_2{\mathrm{O}}_{2 }+ {\mathrm{H}}_2{\mathrm{SO}}_4⟶$