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  4. The colour of transition metal ions is due to presence of unpaired electron transitions in available empty electron in

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Q. The colour of transition metal ions is due to presence of unpaired electron transitions in available empty electron in

J & K CETJ & K CET 2007The d-and f-Block Elements

Solution:

The colour of transition metal ions arises from the excitation of unpaired electrons from the $d$-orbital of lower energy to the $d$-orbital of higher energy. This is for the reason that transition metal ions have the property to absorb certain radiations from the visible region and exhibit the complementary colour.