(D) $4f$ and $5f$ orbitals are not equally shielded. $5f$ orbitals provide poorer shielding than $4f$ orbitals because $5f$ orbitals are more diffused

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$4f$ and $5f$ orbitals are equally shielded.

(D) $4f$ and $5f$ orbitals are not equally shielded. $5f$ orbitals provide poorer shielding than $4f$ orbitals because $5f$ orbitals are more diffused and extend further from the nucleus. Thus,the statement that $4f$ and $5f$ orbitals are equally shielded is incorrect.

Class 12 Chemistry The d- and f-Block Elements General Characteristics

Easy

Identify the incorrect statement in the following.

A
$d$-block elements show irregular and erratic chemical properties among themselves.
B
$La$ and $Lu$ have partially filled $d$-orbitals and no other partially filled orbitals.
C
The chemistry of various Lanthanoids is similar.
D
$4f$ and $5f$ orbitals are equally shielded.