Which one of the following ions exhibits transition and paramagnetism as well?

Question

Which one of the following ions exhibits  transition and paramagnetism as well?

Canvas Classes · Accepted Answer

🧠 The "Unpaired" Hunt
Colors in transition metal complexes usually come from  transitions, which require at least one electron in a -orbital ( to ). Paramagnetism also requires at least one unpaired electron.

🗺️ The Electronic Audit
1.  and :  is in  state. Configuration . No -electrons  No  transition, diamagnetic. (Color here is due to Charge Transfer, not ).
2. :  is in  state. Configuration .  No  transition, diamagnetic. (Color is Charge Transfer).
3.  (Manganate):  is in  state. 
   - C

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