Chemistry - f-block Question with Solution | TestHub

(i) Colour of lanthanoids ions may be attributed due to the presence of f-electrons. La³⁺ ion do not show any colour, because of empty f-orbital. Lu³⁺ ion do not show any colour, because of completely field f-orbitals.(ii) Since $\text{M}{\text{n}}^{2+}(\text{Z}=25)=3{\text{d}}^5,4{\text{s}}^0$  has maximum number of unpaired electrons.therefore Mn²⁺ exhibit maximum paramagnetism.