JEE Main · 2007 · 29 Apr 2007 · Offline · d and f Block Elements

Identify the incorrect statement among 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 very similar
(D) $4 f$ and $5 f$ orbitals are equally shielded✓ Correct

Answer: (D)

Solution

Testing the statements, the

4 f

and

5 f

orbitals are not shielded to the same extent: the

4 f

set is buried and screened more effectively than the more exposed

5 f

set. The claim that the two are equally shielded is therefore the incorrect statement, while the remarks about the close similarity of the lanthanoids and the behaviour of the d-block elements stand.

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

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