Which of the following transition metal ions is colourless in aqueous solution?

Question

Canvas Classes · Accepted Answer

Colourless ions have  or  configuration (no  transition possible)

| Ion | Config | Colour |
|-----|--------|--------|
|  |  | Yellow-brown ✗ |
|  |  | Colourless ✓ |
|  |  | Blue ✗ |
|  |  | Faint pink ✗ |

has no d electrons → no  transition → colourless in aqueous solution.

Answer: Option (2) —

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