Inner Transition Element : Lanthanoids(Electronic Configuration, Oxidation States, and Lanthanoid Contraction) NEET Questions

Inorganic Chemistry - D- and F-Block Elements

Inner Transition Element : Lanthanoids(Electronic Configuration, Oxidation States, and Lanthanoid Contraction) MCQ Questions


7.
The number of unpaired electrons in Pr³⁺ (Z = 59) is:
A.
2
B.
1
C.
3
D.
4
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ANSWER :
A. 2
8.
Which lanthanoid ion is colourless and diamagnetic?
A.
Lu³⁺
B.
Sm³⁺
C.
Nd³⁺
D.
Pr³⁺
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ANSWER :
A. Lu³⁺
9.
The electronic configuration of Eu (Z = 63) in the ground state is:
A.
[Xe] 4f⁷ 5d¹ 6s¹
B.
[Xe] 4f⁶ 5d¹ 6s²
C.
[Xe] 4f⁵ 5d² 6s²
D.
[Xe] 4f⁷ 6s²
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ANSWER :
D. [Xe] 4f⁷ 6s²
10.
Which of the following has the same number of unpaired electrons as Mn²⁺?
A.
Ce³⁺
B.
Yb²⁺
C.
Eu²⁺
D.
Pr³⁺
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ANSWER :
C. Eu²⁺
11.
Which lanthanoid has the electronic configuration [Xe] 4f¹⁴ 6s²?
A.
Er
B.
Tm
C.
Lu
D.
Yb
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ANSWER :
D. Yb
12.
The +3 oxidation state is the most stable for lanthanoids because:
A.
It has half-filled f-orbitals
B.
Loss of 6s² and one 5d/4f electron gives stable configuration
C.
It has noble gas configuration
D.
It has fully filled f-orbitals
😑 View Answer Rough Work Error
ANSWER :
B. Loss of 6s² and one 5d/4f electron gives stable configuration