M K Verma Solutions for Chapter: d-Block and f-Block Elements, Exercise 1: TOPICWISE QUESTIONS

Which of the following statement(s) is/are correct?
$\mathrm{a}$. The oxidation potential $\left(\mathrm{M}/{\mathrm{M}}^{2+}\right)$ of $\mathrm{Cu}$ is least in the $3\mathrm{d}$ series.
$\mathrm{b}$. ${\mathrm{Fe}}^{3+}$ is more stable than ${\mathrm{Mn}}^{3+}$ in aqueous solution.
$\mathrm{c}$. Exchange energy is more in case of ${\mathrm{Fe}}^{3+}$than ${\mathrm{Mn}}^{3+}$.
$\mathrm{d}$. First $\mathrm{IE}$ of $\mathrm{Mn}$ is more than that of $\mathrm{Fe}$.

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:

Identify the mismatch.

Identify the mismatch.

${\mathrm{FeCr}}_2{\mathrm{O}}_4+{\mathrm{Na}}_2{\mathrm{CO}}_3+{\mathrm{O}}_2 \stackrel{\mathrm{Fusion}}{\to } \left[\mathrm{X}\right] \underset{{\mathrm{H}}_2\mathrm{O}}{\overset{{\mathrm{H}}^{+}}{\to }} \left[\mathrm{Y}\right] \underset{{\mathrm{H}}^{+}}{\overset{{\mathrm{H}}_2{\mathrm{O}}_2}{\to }} \left[\mathrm{Z}\right]$

Which of the following statements is true for the compounds $\left[\mathrm{X}\right], \left[\mathrm{Y}\right]$ and $\left[\mathrm{Z}\right]$?

The unstable green colored ${\mathrm{K}}_2{\mathrm{MnO}}_4$ is converted to purple color. Then the correct statements are 
a. It is a disproportionation reaction.
b. The product formed is ${\mathrm{KMnO}}_4$.
c. Nature of the overall solution becomes alkaline.
d. It produces black precipitates of ${\mathrm{MnO}}_2$.

Which of the following represents the incorrect order of property mentioned?

Which of the following statements is incorrect?