Embibe Experts Solutions for Chapter: The d- and f-block Elements, Exercise 2: Level 2

A compound is yellow when hot and white when cold. The compound is:

Match the compounds of column $\mathrm{X}$ with oxidation state of column $\mathrm{Y}$.

STATEMENT-$1$: Ammonical silver nitrate converts glucose to gluconic acid and metallic silver is precipitated

STATEMENT-$2$: Glucose acts as a weak reducing agent.

The final products obtained for the following reaction is ${\mathrm{KMnO}}_4$ (excess) $+{\mathrm{H}}_2{\mathrm{SO}}_4$ (concentrated and cold) $⟶$

$\mathrm{ZnO}+\mathrm{CoO}\stackrel{\mathrm{\Delta }}{⟶}\mathrm{X}$; Product '$\mathrm{X}$' colour is

${\mathrm{E}}^{⊝}$ values for couples ${\mathrm{Cr}}^{3+}/{\mathrm{Cr}}^{2+}$ and ${\mathrm{Mn}}^{3+}/{\mathrm{Mn}}^{2+}$ are $-0.41$ and $+1.51$ volts, respectively. Considering these values, select the correct option from the following statements.

Amongst the following the lowest degree of paramagnetism per mole of the compound at $298 \mathrm{K}$ will be shown by:

In a titration experiment, $10 \mathrm{mL}$ of an ${\mathrm{FeCl}}_2$ solution consumed $25 \mathrm{mL}$ of a standard ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ solution to reach the equivalent point. The standard ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ solution is prepared by dissolving $1.225 \mathrm{g}$ of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ in $250 \mathrm{mL}$ water The concentration of the ${\mathrm{FeCl}}_2$ solution is closest to [Given: molecular weight of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7=294 \mathrm{g} {\mathrm{mol}}^{-1}$]