Question: Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect ?
Ln(III) compounds are generally colourless
Ln(III) hydroxides are mainly basic in character
Because of the large size of the Ln(III) ions the bonding in its compounds is predominently
ionic in character
The ionic sizes of Ln(III) decrease in general with increasing atomic number
Correct Option: 1
