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

Options

A. because of the large size of Ln (III) ions, the bonding in their compounds is predominatly ionic in character.
B. the ionic size of Ln (III) decreases in general with increasing atomic number
C. Ln (III) compounds are generally colourless
D. Ln (III) hydroxides are mainly basic in character.

Answer

C