Question

Identify the incorrect statement from the following : 

(1) The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction 

(2) Zirconium and Hafnium have identical radii of 160 pm and 159 pm, respectively as a consequence of lanthanoid contraction 

(3) Lanthanoids reveal only +3 oxidation state 

(4) The lanthanoid ions other than the f⁰ type and the f¹⁴ type are all paramagnetic

Comments

The d and f block elements, The lanthanoids

Answer 1

Ans: (3) Lanthanoids reveal only +3 oxidation state

Sol. 

• Lanthanoids can show +2 or +4 oxidation states in solution or in solid compounds. 
• Most common oxidation state of Lanthanoids is +3.