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The color of a transition metal complex results from which of the following reasons?

(A) stretching vibrations. (B) transition of an electron between d orbitals. (C) transition of an electron between s and p orbital. (D) nuclear magnetic resonance.
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Answer: transition of an electron between d orbitals
Transition metals are defined as having partly filled d orbitals.
When an electron from a lower energy d orbital is excited to a higher energy d orbital, the energy of excitation corresponds to the frequency of light absorbed.
This frequency generally lies in the visible region. The colour observed corresponds to the complementary colour of the light absorbed.
The frequency of the light absorbed is determined by the nature of the ligand.
answered Jan 29, 2014 by sreemathi.v
edited Jul 31, 2014 by balaji.thirumalai

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