Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

Question

Canvas Classes · Accepted Answer

Concept: Coloured solutions require partially filled d orbitals

| Compound | Ion | d config | Coloured? |
|----------|-----|----------|----------|
|  |  |  | Colourless ✗ |
|  |  |  | Colourless ✗ |
|  |  |  | Blue-green ✓ |
| AgCl |  |  | Colourless ✗ |

dissolves in water to give  () — blue-green coloured solution due to  transition.

Note: Nitrogen atmosphere prevents oxidation of Cu(I) to Cu(II), but  already contains Cu(II).

Answer: Option (3) —

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