Actinoids (Electronic Configuration and Oxidation States) NEET Questions

Inorganic Chemistry - D- and F-Block Elements

Actinoids (Electronic Configuration and Oxidation States) MCQ Questions


1.
The general electronic configuration of actinoids is:
A.
[Xe] 4f¹⁻¹⁴ 5d⁰⁻¹ 6s²
B.
[Rn] 5f¹⁻¹⁴ 6d⁰⁻² 7s¹
C.
[Kr] 4d¹⁻¹⁰ 5s¹⁻²
D.
[Rn] 5f¹⁻¹⁴ 6d⁰⁻¹ 7s²
😑 View Answer Rough Work Error
ANSWER :
D. [Rn] 5f¹⁻¹⁴ 6d⁰⁻¹ 7s²
2.
The most common oxidation state exhibited by actinoids is:
A.
+4
B.
+2
C.
+6
D.
+3
😑 View Answer Rough Work Error
ANSWER :
D. +3
3.
The maximum oxidation state shown by actinoids is exhibited by:
A.
Thorium (Th)
B.
Uranium (U)
C.
Neptunium (Np)
D.
Plutonium (Pu)
😑 View Answer Rough Work Error
ANSWER :
C. Neptunium (Np)
4.
The electronic configuration of Th (Z = 90) is:
A.
[Rn] 6d² 7s²
B.
[Rn] 5f¹ 6d¹ 7s²
C.
[Rn] 5f² 7s²
D.
[Rn] 5f² 6d⁰ 7s²
😑 View Answer Rough Work Error
ANSWER :
A. [Rn] 6d² 7s²
5.
Which of the following pairs represents the actinoids with [Rn] 5f⁷ 7s² and [Rn] 5f⁷ 6d¹ 7s² configurations respectively?
A.
Pu and Am
B.
Eu and Gd
C.
Am and Cm
D.
Bk and Cf
😑 View Answer Rough Work Error
ANSWER :
C. Am and Cm
6.
The actinoid contraction is greater than lanthanoid contraction because:
A.
5f electrons are better at shielding than 4f electrons
B.
5f electrons provide poorer shielding from nuclear charge compared to 4f electrons
C.
Actinoids are radioactive
D.
Actinoids have higher nuclear charge
😑 View Answer Rough Work Error
ANSWER :
B. 5f electrons provide poorer shielding from nuclear charge compared to 4f electrons