question_answer 55)

    Which of the following oxidation state is common for all lanthanoids? (a) +2           (b) +3           (c) +4           (d) +5

Answer:

                    (b) Lanthanoids show common oxidation state of +3. Some of which also show +2 and +4 stable oxidation state along with +3 oxidation state/These are shown by those elements which by losing 2 or 4 electrons acquire a stable configuration of   or e.g.,