question_answer 105)

                Match the property given in Column I with the element given in Column II.

	Column I (Property)	Column II (Element)
A.	Lanthanoid which shows + 4 oxidation state	1. Pm
B.	Lanthanoid which can show +2 oxidation  state	2. Ce
C.	Radioactive lanthanoid	3. Lu
D.	Lanthanoid which has  electronic	4. Eu
	configuration in +3 oxidation state
E.	Lanthanoid which has  electronic configuration in +3 oxidation state	5. Gd
		6. Dy

         

Answer:

                      A. ® (2)    B. ® (4)    C. ® (1)    D. ® (5)    E. ® (3) Lanthanoid which shows +4 oxidation state is cerium. ; Oxidation state = +3, +4 B. Lanthanoid which can show +2 oxidation state is europium. ;Oxidation state = +2, +3 C. Radioactive lanthanoid is promethium. It is the only synthetic (man-made) radioactive lanthanoid. D. Lanthnoid which has  electronic configuration in +3 oxidation state is gadolinium. ; Oxidation state = +3 E. Lanthanoid which has  electronic configuration in +3 oxidation state is lutetium ; Oxidation state = +3