[" 57.Knowing that the chemistry of lanthanoids (Ln) is dominated by its + 3oxidation state,which of "],[" the following statement is incorrect? "]

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

Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect?

Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect?