MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
Which orbital has comparatively lower energy?
Think it through first, then pick an option.
- a 3d
- b 4p
- c 5s
- d 4f
Answer and explanation
Correct answer: a 3d
3d, 4p and 5s all have n + l = 5; of these, 3d has the smallest n.
Why the other options are wrong
- b 4p: 4p has n + l = 5, equal to 3d, but its n is larger (4 > 3).
- c 5s: 5s has n + l = 5, but its n = 5 is the largest of the three.
- d 4f: 4f has n + l = 4 + 3 = 7, the highest here, so its energy is highest.
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