In following pairs, the one in which both transition metal ions are colourless is:

Question

Canvas Classes · Accepted Answer

Concept: Colour requires partially filled d orbitals (–).  and  ions are colourless.

| Ion | Config | Colour |
|-----|--------|--------|
|  |  | Colourless ✓ |
|  |  | Colourless ✓ |
|  |  | Colourless ✓ |
|  |  | Blue (coloured) ✗ |
|  |  | Violet ✗ |
|  |  | Purple ✗ |
|  |  | Faint pink ✗ |

Option (1): Both  () and  () are colourless. ✓

Answer: Option (1)

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