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d- and f-Block Elements: Colour of compounds MCQ

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Colour of compoundsEasyQuestion 860003

Question

Transition metal compounds are often coloured because:
  1. A
    d-d transitions absorb visible light (complementary colour observed)
    Correct
  2. B
    They reflect all light
  3. C
    They are ionic
  4. D
    Large lattice energy

Correct answer

d-d transitions absorb visible light (complementary colour observed)

Explanation

In a crystal field, d-orbitals split into different energy levels. Electrons absorb photons of visible light for d-d transitions → the complementary colour is observed. Zn²⁺ (d¹⁰), Sc³⁺ (d⁰) have no d-d transitions → colourless.

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