Actinoids (Electronic Configuration and Oxidation States) NEET Questions

Inorganic Chemistry - D- and F-Block Elements

Actinoids (Electronic Configuration and Oxidation States) MCQ Questions


13.
The number of unpaired electrons in U³⁺ (Z = 92) is:
A.
2
B.
3
C.
4
D.
1
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ANSWER :
B. 3
14.
Which of the following is the correct order of filling of orbitals in actinoids?
A.
7s is filled after 5f
B.
5f and 6d are filled simultaneously due to comparable energies
C.
6d orbitals are filled before 5f
D.
5f orbitals are filled before 6d
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ANSWER :
B. 5f and 6d are filled simultaneously due to comparable energies
15.
The electronic configuration of Cm (Z = 96) is:
A.
[Rn] 5f⁸ 7s²
B.
[Rn] 5f⁹ 7s¹
C.
[Rn] 5f⁷ 6d¹ 7s²
D.
[Rn] 5f⁶ 6d² 7s²
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ANSWER :
C. [Rn] 5f⁷ 6d¹ 7s²
16.
Actinoid contraction refers to:
A.
Contraction of d-orbitals in actinoids
B.
Gradual decrease in atomic and ionic radii across the actinoid series
C.
Increase in atomic size across the actinoid series
D.
Reduction in nuclear charge along the series
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ANSWER :
B. Gradual decrease in atomic and ionic radii across the actinoid series
17.
Which actinoid shows the maximum number of oxidation states?
A.
Thorium
B.
Neptunium
C.
Uranium
D.
Plutonium
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ANSWER :
D. Plutonium
18.
The actinoid which has electronic configuration similar to its lanthanoid counterpart Gd is:
A.
Th
B.
Cm
C.
Am
D.
U
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ANSWER :
B. Cm