Question
Which of the following elements in +3 oxidation state forms colourless compounds?
MHT CET
Chemistry
d and f Block Elements
2026
MHT CET 2026 (15 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. Sc
- B. Ni
- C. Cr
- D. V
Answer
A. Sc
Step-by-step solution
The atomic number of Sc is 21. The electronic configuration of Sc is [ Ar ] 3d^ 1 4s^ 2 . In the +3 oxidation state, the electronic configuration of Sc ^ 3+ is [ Ar ] 3d^ 0 4s^ 0 . Since there are no unpaired electrons in the d-orbital of Sc ^ 3+ , d-d transitions are not possible. Therefore, Sc ^ 3+ forms colourless compounds. Answer: Sc
Related: Chemistry — d and f Block Elements · All PYQ Banks