Chemistry - Complete d-block Question with Solution | TestHub

(P) ${\mathrm{Ni}}^2{}^{\oplus }-{\mathrm{d}}^8$-green - paramagnetic, $\mu =2.84$

(Q) ${\mathrm{Cr}}^{2\oplus }-{\mathrm{d}}^4$-blue - paramagnetic, $\mu =4.96$

${\mathrm{Cr}}^2\oplus \to 3{\mathrm{d}}^4\to$ d-d transition because in aq. medium it exists as. ${\left[\mathrm{Cr}\left({\mathrm{H}}_2\mathrm{O}\right)6\right]}^{2+}$

(R) ${\mathrm{V}}^{2\oplus }-{\mathrm{d}}^3$ - violet - paramagnetic, $\mu =3.92{\mathrm{V}}^{2\oplus }\to {\mathrm{d}}^3\to {\mathrm{t}}_{2\mathrm{g}}^3{\mathrm{e}}_{\mathrm{g}}^0$

(S) ${\mathrm{Ti}}^4{}^{+}-{\mathrm{d}}^0$-colourless - diamagnetic, $\mu =0$