(C) Lanthanoids exhibit a primary oxidation state of $+3$. However, they can also show $+2$ or $+4$ oxidation states in certain solutions or solid com

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Lanthanoids reveal only $+3$ oxidation state.

(C) Lanthanoids exhibit a primary oxidation state of $+3$. However, they can also show $+2$ or $+4$ oxidation states in certain solutions or solid compounds.Therefore, the statement that they reveal only $+3$ oxidation state is incorrect.

Class 12 Chemistry d-and f-Block Elements Lanthanoids and Actinoids

Medium

Identify the incorrect statement from the following:

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A
The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction.
B
Zirconium and Hafnium have identical radii of $160 \; pm$ and $159 \; pm$, respectively, as a consequence of lanthanoid contraction.
C
Lanthanoids reveal only $+3$ oxidation state.
D
The lanthanoid ions other than the $f^{0}$ type and the $f^{14}$ type are all paramagnetic.