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

Options

A. Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character
B. The ionic sizes of Lu (III) decrease in general with increasing atomic number
C. Lu (III) compounds are generally colourless
D. Lu (III) hydroxide are mainly basic in character

Answer

C

Explanation

The most common oxidation state of lanthanoid is +3. Lanthanoids in +3 oxidation state usually have unpaired electron in f-subshell and impart characterristic colour in solid as well as in solution state due to f-f transition. (Except lanthanum and lutetium).