Which one of the following elements forms compounds that are all … - Vidyadip

MCQ

Which one of the following elements forms compounds that are all coloured?

A
Magnesium.
B
Aluminium.
C
Iron.
✓
Chromium.

✓

Answer

Correct option: D.

Chromium.

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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