Chemistry - Complete d-block Question with Solution | TestHub

A.${\mathrm{V}}^{2+}$has 3 unpaired electrons

$\mathrm{C}{\mathrm{r}}^{2+}$has 4 unpaired electrons

$\mathrm{M}{\mathrm{n}}^{2+}$has 5 unpaired electrons

$\mathrm{F}{\mathrm{e}}^{2+}$has 4 unpaired electrons

Hence the order of paramagentic behaviour should be

${\mathrm{V}}^{2+}<\mathrm{C}{\mathrm{r}}^{2+}=\mathrm{F}{\mathrm{e}}^{2+}<\mathrm{M}{\mathrm{n}}^{2+}$

B. Ionic size decreases from left to right in same period.

C. As per data, we have

${\text{Co}}^{3+}|{\text{Co}}^{2+}=1.97;{\text{Fe}}^{3+}|{\text{Fe}}^{2+}=0.77;{\text{Cr}}^{3+}|{\text{Cr}}^{2+}=-0.41$

$\mathrm{S}{\mathrm{c}}^{3+}$is highly stable, because it does not show +2.

D. The oxidation state increases as we go from group 3 to group 7 in same period.