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

Question

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

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Answer

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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