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 of the bonding in its compounds is predominently ionic in chracter.

Answer

2

Explanation

Most of the trivalent lanthanoid compound except that of `La^(3+)` and `Lu^(3+)` are coloured both in the solid state and in the solid state nd in the aqueous solution. The colour of these ions can be attribute due to the presence of unpaired `f`-electrons.