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

${\mathrm{E}}^{⊝}$ 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.

Magnetic moment of ${\mathrm{Cr}}^{+2}\left(\mathrm{Z}=24\right), {\mathrm{Mn}}^{+2}\left(\mathrm{Z}=25\right)$ and ${\mathrm{Fe}}^{2+}\left(\mathrm{Z}=26\right)$ are $\mathrm{x}, \mathrm{y}, \mathrm{z}$. They are in order:

The yellow colour of chromate changes to orange on acidification due to formation of:

When an acidified solution of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is shaken with an aqueous solution of ${\mathrm{FeSO}}_4$,

Which of the following does not belong to $3\mathrm{d}$ series of transition elements?

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

Which of the following group of ions is paramagnetic in nature:

The lanthanide contraction is responsible for the fact that