4f and 5f belongs to different energy levels, hence the shielding effect is on them is not the same. Shielding of 4f is more than 5f. Hence (D) is correct.
JEE Main 2007 — Chemistry Inorganic Chemistry
Identify the incorrect statement among the following
Held on 30 Apr 2007 · Verified 6 Jul 2026.
d− Block elements show irregular and erratic chemical properties among themselves
La and Lu have partially filled d orbitals and no other partially filled orbitals
The chemistry of various lanthanoids is very similar
4f and 5f orbitals are equally shielded
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