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The d & f Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
Which one of the following elements forms compounds that are all coloured?
  • A
    Magnesium.
  • B
    Aluminium.
  • C
    Iron.
  • D
    Chromium.
✓

Answer

  1. Chromium.

Explanation:

Most of the chromium compounds are coloured due to excitation of an electron from a lower energy d-orbital to higher energy d-orbital, the energy of excitation corresponds to the frequency of light absorbed. This frequency lies in a visible region. The colour observed corresponds to the complementary colour of light absorbed.

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