Identify the incorrect statement in the follo | vedclass

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(D) The correct answer is $D$. $1$. $d$-block elements exhibit variable oxidation states and irregular properties due to the involvement of $(n-1)d$ e

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$4f$ and $5f$ orbitals are equally shielded by inner electrons.

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(D) The correct answer is $D$. $1$. $d$-block elements exhibit variable oxidation states and irregular properties due to the involvement of $(n-1)d$ electrons. $2$. $La$ $([Xe] 5d^1 6s^2)$ and $Lu$ $([Xe] 4f^{14} 5d^1 6s^2)$ have partially filled $d$-orbitals. $3$. Lanthanoids show a high degree of similarity in their chemistry due to the Lanthanoid contraction and the $+3$ oxidation state being the most stable. $4$. The shielding effect of $f$-orbitals is very poor. However,$4f$ orbitals are more effectively shielded by inner electrons compared to $5f$ orbitals,and they are not equally shielded. Thus,statement $D$ is incorrect.

Identify the incorrect statement in the following.

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