Knowing that the chemistry of lanthanoids (Ln) is dominated by its `+3` oxidation state, which of the following statement is incorrect?

Options

A. The ionic sizes of Ln(III) decrease in general with increasing atomic number.
B. Ln(III) compounds are generally colourless
C. Ln(III)hydroxides are mainly basic in character
D. Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in character.

Explanation

Ln(III)compounds are generally coloured due to partly filled f-orbitals which permit f-f transition.