Electronic Configuration of Elements, Extra Stability of Half-Filled and Completely Filled Orbitals. NEET Questions

Physical Chemistry - Atomic Structure

Electronic Configuration of Elements, Extra Stability of Half-Filled and Completely Filled Orbitals. MCQ Questions


7.
Which of the following has maximum number of unpaired electrons?
A.
V³⁺
B.
Mg²⁺
C.
Fe³⁺
D.
Ti³⁺
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ANSWER :
C. Fe³⁺
8.
The electronic configuration of Cr³⁺ ion is:
A.
[Ar] 3d³
B.
[Ar] 3d⁴
C.
[Ar] 3d²4s¹
D.
[Ar] 3d⁵ 4s¹
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ANSWER :
A. [Ar] 3d³
9.
The orbital with maximum (n + l) value among the following will have highest energy:
A.
n = 5, l = 0
B.
n = 4, l = 2
C.
n = 3, l = 2
D.
n = 4, l = 1
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ANSWER :
B. n = 4, l = 2
10.
The number of unpaired electrons in the ground state of chromium atom (Z = 24) is:
A.
6
B.
5
C.
3
D.
4
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ANSWER :
A. 6
11.
Which of the following electronic configurations represents an excited state of an atom?
A.
1s² 2s² 2p⁶ 3s² 3p¹
B.
1s² 2s² 2p⁶
C.
1s² 2s² 2p⁶ 3s¹
D.
1s² 2s² 2p⁵ 3s¹
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ANSWER :
D. 1s² 2s² 2p⁵ 3s¹
12.
The correct order of filling of orbitals according to Aufbau principle is:
A.
1s, 2s, 3s, 2p, 3p, 4s, 3d
B.
1s, 2s, 2p, 3s, 3p, 3d, 4s
C.
1s, 2s, 2p, 3p, 3s, 3d, 4s
D.
1s, 2s, 2p, 3s, 3p, 4s, 3d
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ANSWER :
D. 1s, 2s, 2p, 3s, 3p, 4s, 3d