Question:medium
Which of the following transition metal ion is not coloured?
Which of the following transition metal ion is not coloured?
Show Hint
A transition metal ion is colourless if it has a completely filled or completely empty d-orbital configuration.
Updated On: Feb 24, 2026
- Cu$^+$
- Ni$^{2+}$
- Co$^{2+}$
- V$^{3+}$
Show Solution
The Correct Option is A
Solution and Explanation
Transition metal ion colour stems from unpaired d-orbital electrons enabling d-d transitions. Cu$^+$ has an electronic configuration of [Ar] 3d$^{10}$, with all paired electrons, precluding d-d transitions. Consequently, it is colourless.
Was this answer helpful?
0
Top Questions on d -and f -Block Elements
- Statement-I : Consider the following pairs of ions $(\text{Sc}^{3+}, \text{Ti}^{3+}), (\text{Ti}^{4+}, \text{Ni}^{2+}), (\text{Cu}^{2+}, \text{Zn}^{2+})$ and $(\text{Cr}^{3+}, \text{Mn}^{3+})$. Out of these pairs three pairs consist of ions that are both coloured :
Statement-II : Among the lanthanide ions $\text{Eu}^{2+}$, $\text{Gd}^{3+}$, $\text{Ce}^{4+}$ and $\text{Tb}^{4+}$, the ion $\text{Tb}^{4+}$ is the strongest reducing agent.
Choose the correct option.- JEE Main - 2026
- Chemistry
- d -and f -Block Elements
- What happens when acidic solution of potassium permanganate is allowed to stand for sometime ? Give the equation involved. What is this type of reaction called ?
- CBSE Class XII - 2026
- Chemistry
- d -and f -Block Elements
- Why Cr has higher melting point than Mn ?
- CBSE Class XII - 2026
- Chemistry
- d -and f -Block Elements
- Why transition metals act as good catalyst ?
- CBSE Class XII - 2026
- Chemistry
- d -and f -Block Elements
- Want to practice more? Try solving extra ecology questions todayView All Questions
