Which of the following statements is incorrec | vedclass

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(D) The correct answer is $D$. Statement $A$ is correct as $d$-block elements show variable oxidation states and irregular properties. Statement $B$ i

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$4f$ and $5f$ orbitals have similar screening effects.

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(D) The correct answer is $D$. Statement $A$ is correct as $d$-block elements show variable oxidation states and irregular properties. Statement $B$ is incorrect because $La$ $([Xe] 5d^1 6s^2)$ has no $f$-electrons,and $Lu$ $([Xe] 4f^{14} 5d^1 6s^2)$ has a completely filled $f$-subshell. Statement $C$ is correct as lanthanoids exhibit high chemical similarity due to the lanthanoid contraction. Statement $D$ is incorrect because $4f$ orbitals have a much better shielding effect than $5f$ orbitals,although both are poor compared to $s$ and $p$ orbitals. However,in the context of standard chemistry questions,the statement regarding $4f$ and $5f$ screening is often cited as the most fundamentally incorrect comparison regarding their shielding efficiency.

Which of the following statements is incorrect?

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