Rules for Filling Electrons in Orbitals - Aufbau Principle NEET Questions

Physical Chemistry - Atomic Structure

Rules for Filling Electrons in Orbitals - Aufbau Principle MCQ Questions


1.
Which principle governs the filling of electrons in orbitals?
A.
Pauli’s exclusion principle
B.
Hund’s rule
C.
Aufbau principle
D.
Heisenberg’s uncertainty principle
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ANSWER :
C. Aufbau principle
2.
According to the Aufbau principle, which orbital will be filled first?
A.
3p
B.
3d
C.
4s
D.
4p
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ANSWER :
C. 4s
3.
The Aufbau principle is based on:
A.
Minimum energy rule
B.
Maximum multiplicity rule
C.
Uncertainty principle
D.
Pauli’s principle
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ANSWER :
A. Minimum energy rule
4.
Which of the following orbitals will be filled after 3p?
A.
3d
B.
4s
C.
4p
D.
5s
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ANSWER :
B. 4s
5.
Which of the following violates the Aufbau principle?
A.
1s² 2s² 2p⁶ 3s²
B.
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
C.
1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴ 4s²
D.
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹
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ANSWER :
C. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴ 4s²
6.
Which element shows an exception to the Aufbau principle?

NEET - 2017

A.
Calcium
B.
Copper
C.
Sulfur
D.
Argon
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ANSWER :
B. Copper