Identify the incorrect statement from the following :

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

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

Lanthanoids reveal only $+ 3$ oxidation state.

The lanthanoid ions other than the $f^{0}$ type and the $f^{14}$ type are all paramagnetic.

answer is C.

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Detailed Solution

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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