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

1. CrO4²⁻
2. Cr2O7²⁻
3. MnO4²⁻
4. MnO4⁻

Correct answer: MnO4²⁻

Solution

MnO4²⁻ exhibits d-d transitions because Mn is in a lower oxidation state (+6), allowing partially filled d-orbitals. It is also paramagnetic due to unpaired electrons in its d-orbitals.

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