chemistry : class11 Subshell energy levels : Concept of subshells : Structure of Atom MCQ Questions and Answers
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Subshell energy levels
MCQ questions and answers.
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MCQ Questions
1. In a multi-electron atom, which subshell generally has the lowest energy in the third shell?
A.
3s
B.
3p
C.
3d
D.
4s
Correct Answer:
3s
Explanation:
Within the same principal shell of a multi-electron atom, subshell energy generally increases in the order s < p < d < f. Therefore, 3s has the lowest energy among the listed third-shell subshells.
2. What is the usual order of increasing energy of subshells within the same principal shell in a multi-electron atom?
A.
s < p < d < f
B.
f < d < p < s
C.
p < s < f < d
D.
d < f < s < p
Correct Answer:
s < p < d < f
Explanation:
For subshells having the same principal quantum number, the usual energy order in multi-electron atoms is s < p < d < f.
3. Which subshell has lower energy in a multi-electron atom?
A.
2p
B.
2s
C.
3p
D.
3d
Correct Answer:
2s
Explanation:
The 2s subshell is lower in energy than 2p because, within the second shell, energy increases from s to p.
4. Which of the following subshells is generally filled first according to the Aufbau energy order?
A.
2p
B.
3s
C.
4s
D.
3d
Correct Answer:
2p
Explanation:
The usual energy order begins with 1s, 2s, and then 2p. Hence, among the listed subshells, 2p has the lowest energy and is filled first.
5. Which subshell has the highest energy among the following subshells in a multi-electron atom?
A.
3s
B.
3p
C.
3d
D.
2p
Correct Answer:
3d
Explanation:
Within the third shell, energy increases as 3s < 3p < 3d. Therefore, 3d has the highest energy among the listed subshells.
6. Which subshell is lower in energy in a multi-electron atom: 4s or 3d?
A.
4s
B.
3d
C.
Both always have the same energy
D.
Their energies cannot be compared
Correct Answer:
4s
Explanation:
According to the usual Aufbau order, 4s is filled before 3d, indicating that 4s is lower in energy initially in a multi-electron atom.
7. In a hydrogen atom, how do the energies of 2s and 2p subshells compare?
A.
2s has lower energy than 2p
B.
2p has lower energy than 2s
C.
2s and 2p have the same energy
D.
Their energies change randomly
Correct Answer:
2s and 2p have the same energy
Explanation:
In a hydrogen atom, subshells with the same principal quantum number have the same energy. Thus, 2s and 2p are degenerate.
8. Which subshell is expected to have greater energy than 3p within the same shell of a multi-electron atom?
A.
3s
B.
2p
C.
3d
D.
2s
Correct Answer:
3d
Explanation:
For subshells in the third shell, the energy order is 3s < 3p < 3d. Therefore, 3d has greater energy than 3p.
9. Which sequence shows the correct increasing energy order of the subshells 1s, 2s, and 2p in a multi-electron atom?
A.
2p < 2s < 1s
B.
1s < 2s < 2p
C.
2s < 1s < 2p
D.
1s < 2p < 2s
Correct Answer:
1s < 2s < 2p
Explanation:
The usual energy order is 1s first, followed by 2s and then 2p. Thus, the increasing order is 1s < 2s < 2p.
10. Which subshell generally has the lowest energy among 4s, 4p, 4d, and 4f in a multi-electron atom?
A.
4s
B.
4p
C.
4d
D.
4f
Correct Answer:
4s
Explanation:
Within the same fourth shell, subshell energy generally increases in the order 4s < 4p < 4d < 4f. Therefore, 4s has the lowest energy.
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