The set having ions which are coloured and paramagnetic both is:

Question

Canvas Classes · Accepted Answer

Need: partially filled d orbitals (–) for both colour and paramagnetism.

Option (1):

| Ion | Config | Unpaired e⁻ | Coloured | Paramagnetic |
|-----|--------|-------------|----------|--------------|
|  |  | 1 | Yes | Yes ✓ |
|  |  | 3 | Yes | Yes ✓ |
|  |  | 2 | Yes | Yes ✓ |

Other options fail:
-  (): colourless, diamagnetic ✗
- , , : all , colourless, diamagnetic ✗
-  (),  (): colourless, diamagnetic ✗

Answer: Option (1)

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