chemistry : class11 Allowed subshell values : Concept of subshells : Structure of Atom MCQ Questions and Answers
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Allowed subshell values
MCQ questions and answers.
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MCQ Questions
1. For the principal quantum number n = 1, which subshell is allowed?
A.
1s
B.
1p
C.
1d
D.
1f
Correct Answer:
1s
Explanation:
For n = 1, the azimuthal quantum number can only be l = 0, which corresponds to the s subshell. Therefore, only the 1s subshell is allowed.
2. Which subshells are allowed for n = 2?
A.
2s and 2p
B.
2p and 2d
C.
2s, 2p, and 2d
D.
2d only
Correct Answer:
2s and 2p
Explanation:
For n = 2, the allowed values of l are 0 and 1, corresponding to the 2s and 2p subshells.
3. Which of the following subshells is not allowed?
A.
3s
B.
3p
C.
3d
D.
3f
Correct Answer:
3f
Explanation:
For n = 3, the allowed values of l are 0, 1, and 2, giving 3s, 3p, and 3d. The 3f subshell would require l = 3, which is not allowed for n = 3.
4. What is the maximum value of the azimuthal quantum number l for a shell with n = 4?
A.
0
B.
1
C.
3
D.
4
Correct Answer:
3
Explanation:
For a shell with principal quantum number n, l can have values from 0 to n - 1. Thus, for n = 4, the maximum value of l is 3.
5. Which subshell corresponds to l = 2?
A.
s
B.
p
C.
d
D.
f
Correct Answer:
d
Explanation:
The subshell notation is related to l as follows: l = 0 is s, l = 1 is p, l = 2 is d, and l = 3 is f.
6. Which of the following is an allowed subshell for n = 4?
A.
4s
B.
4g
C.
4h
D.
4i
Correct Answer:
4s
Explanation:
For n = 4, allowed l values are 0, 1, 2, and 3, corresponding to s, p, d, and f. Therefore, 4s is allowed, while g, h, and i subshells are not.
7. How many subshells are allowed in the shell with n = 3?
A.
1
B.
2
C.
3
D.
4
Correct Answer:
3
Explanation:
The number of allowed subshells in a shell is equal to n. For n = 3, the allowed subshells are 3s, 3p, and 3d, making a total of three.
8. Which set contains only allowed subshells for n = 3?
A.
3s, 3p, 3d
B.
3s, 3p, 3f
C.
3p, 3d, 3f
D.
3s, 3d, 3f
Correct Answer:
3s, 3p, 3d
Explanation:
For n = 3, l can be 0, 1, or 2, so the allowed subshells are 3s, 3p, and 3d. An f subshell requires l = 3 and is not allowed.
9. Which subshell is allowed for n = 2 but not for n = 1?
A.
1s
B.
2s
C.
1p
D.
2d
Correct Answer:
2s
Explanation:
For n = 2, both 2s and 2p are allowed, whereas for n = 1 only 1s is allowed. The 2s subshell is therefore allowed for n = 2 but not present in n = 1.
10. Which principal quantum number first allows an f subshell?
A.
n = 1
B.
n = 2
C.
n = 3
D.
n = 4
Correct Answer:
n = 4
Explanation:
An f subshell has l = 3. Since l can range from 0 to n - 1, the smallest n that permits l = 3 is n = 4.