Colored Compounds
Which of the following compounds is colorless?
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About This Question
- Subject
- chemistry
- Chapter
- d- and f-block elements
- Topic
- colored compounds
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
ZnSO₄
Color in transition metal complexes usually arises from d−d transitions.
- To show color, the metal ion must have partially filled d-orbitals (d1 to d9).
- Zinc (Zn2+): Electronic configuration is 3d10. Since the d-orbitals are completely filled, no electron can transition between d-energy levels (eg and t2g). Therefore, Zinc salts like ZnSO4 are colorless.
- Cu2+ (3d9), Mn7+ (d0 but shows color due to charge-transfer), and Cr6+ (d0 but shows color due to charge-transfer) all form colored compounds.
This easy difficulty chemistry question is from the chapter d- and f-block elements, covering the topic of colored compounds. It appeared in the 2025 exam.
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