Question
Which of the following cations in their oxidation states forms colored compounds ?
MHT CET
Chemistry
d and f Block Elements
2026
MHT CET 2026 (13 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. Sc ^ 3+
- B. Ti ^ 4+
- C. Cu ^+
- D. V ^ 3+
Answer
D. V ^ 3+
Step-by-step solution
The electronic configurations of the given cations are: Sc ^ 3+ (Z=21): [ Ar ] 3d^0 Ti ^ 4+ (Z=22): [ Ar ] 3d^0 Cu ^ + (Z=29): [ Ar ] 3d^ 10 V ^ 3+ (Z=23): [ Ar ] 3d^2 Cations with d^0 or d^ 10 configurations do not have unpaired electrons for d-d transitions and are generally colorless. V ^ 3+ has two unpaired electrons in its d-orbital, which allows d-d transitions, making its compounds colored. Answer: V ^ 3+
Related: Chemistry — d and f Block Elements · All PYQ Banks