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.
The word "Aufbau" is derived from which language and what does it mean?
A.
Greek, meaning "arrangement"
B.
German, meaning "building up"
C.
French, meaning "ordering"
D.
Latin, meaning "filling"
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ANSWER :
B. German, meaning "building up"
2.
According to the Aufbau principle, in the ground state of atoms:
A.
Orbitals are filled randomly
B.
Higher energy orbitals are filled first
C.
All orbitals are filled simultaneously
D.
Orbitals are filled in order of their increasing energies
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ANSWER :
D. Orbitals are filled in order of their increasing energies
3.
Which rule is used to determine the relative energies of orbitals in multi-electron atoms?
A.
Heisenberg uncertainty principle
B.
Hund's rule
C.
(n + l) rule
D.
Pauli exclusion principle
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ANSWER :
C. (n + l) rule
4.
According to (n + l) rule, which orbital among the following has the lowest energy?
A.
4p (n + l = 5)
B.
4s (n + l = 4)
C.
5s (n + l = 5)
D.
3d (n + l = 5)
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ANSWER :
B. 4s (n + l = 4)
5.
When two orbitals have the same value of (n + l), which one has lower energy?
A.
The orbital with higher value of l
B.
The orbital with lower value of n
C.
Both have equal energy
D.
The orbital with higher value of n
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ANSWER :
B. The orbital with lower value of n
6.
Which of the following is the correct order of filling of orbitals according to the Aufbau principle?
A.
1s, 2s, 3s, 4s, 2p, 3p, 4p, 3d
B.
1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p
C.
1s, 2p, 2s, 3p, 3s, 3d, 4s, 4p
D.
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p
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ANSWER :
D. 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p