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A colloidal gold solution appears red rather than gold-coloured because of

  • A.quantum confinement of its electrons
  • B.the depression of its melting point
  • C.a change in the metal's crystal structure
  • D.surface plasmon resonance absorption

Answer: D

The conduction electrons oscillate collectively at a frequency in the visible, absorbing green light and leaving the solution red. The position of the band shifts with particle size and shape, which makes it a useful diagnostic.

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