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 size of Ln (III) decrease in general with increasing atomic number .
B. Ln (III) compounds are generally colourless.
C. Ln (III) compounds are mainly basic in character.
D. Becauses of the large size of the Ln (III) ions in character.

Answer

B

Explanation

Most of the `Ln^(3+)` compounds except `La^(3+)` and `Lu^(3+)` are coloured due to the presence of f- electrons.