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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

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The d and f block elements, The lanthanoids

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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.
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