1.

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

Answer»

Because of the LARGE size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character
The ionic sizes of LU (III) DECREASE in general with increasing atomic number
Lu (III) compounds are generally colourless
Lu (III) hydroxide are mainly basic in character

Solution :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).


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