D And F Block Elements

Consider the following statements in respect of lanthanides, which of the statements are incorrect?

(i) \(\mathrm{La}(\mathrm{OH})_3\) is least basic among the hydroxides of lanthanides

(ii) The lanthanide ions \(\mathrm{Yb}^{2+}, \mathrm{Lu}^{3+}\) and \(\mathrm{Ce}^{4+}\) are diamagnetic in nature.

(iii) \(\mathrm{Ce}^{4+}\) can act as an oxidising agent

(iv) \(\operatorname{Ln}\) (III) compounds are generally colourless

(v) Ionic radii of \(\mathrm{Ce}^{3+}\) is greater than \(\mathrm{Yb}^{3+}\)