Question

Knowing that the chemistry of lanthanoids (Ln) is dominated by its `+3` oxidation state, which of the following statement is incorrect?
A. Because of the large size of the Ln(III) ions the bonding in its compounds is predominantly inoni in character.
B. The ionic sizes of Ln(III) decrease in general with increasing atomic number
C. Ln(III) compounds are generally colourless
D. Ln(III) hydroxides are mainly basic in character.

Answer 1

Correct Answer - C
`Ln^(3+)` compounds are generally coloured in the solid state as well as in presence of f-electrons which undergo f-f transitions.