Home › NEET UG › Chemistry › d- and f-Block Elements ›  Transition metal ions with partially filled d orbitals are usually coloured. This colour arises from:
ACharge transfer between metal and ligand only
Bd-d electronic transitions — absorption of visible light promotes an electron from a lower-energy d-orbital (t₂g) to a higher one (eg); the observed colour is complementary to the absorbed
CNuclear transitions
DVibrational transitions
Answer & Solution
Correct answer: B. d-d electronic transitions — absorption of visible light promotes an electron from a lower-energy d-orbital (t₂g) to a higher one (eg); the observed colour is complementary to the absorbed
**d-d transitions**: in a ligand field, d-orbitals split (e.g., t₂g/eg in octahedral). The energy gap **Δ_o is typically in the visible range** → absorption of one colour → complementary colour observed. d⁰ and d¹⁰ ions have no transitions → colourless.
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