Chemistry - Complete d-block Question with Solution | TestHub

${\mathrm{C}\mathrm{o}\mathrm{S}\mathrm{O}}_4$have${\mathrm{d}}^7$configuration because$\left({\mathrm{C}\mathrm{o}}^{2+}=3{\mathrm{d}}^7\mathrm{ }4\mathrm{s}°\right)$, thus it both paramagnetic as well as coloured.\

${\text{K}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$and${\text{KMnO}}_4$are colured due in change spectra.