Question

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

• 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.

Answer 1

The correct option is B

Ln (III) compounds are generally colourless.

Lanthanoid compounds are coloured.