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why is [FeCl4]2- is colourless ?

why is  [FeCl4]2- is colourless ?
 

Grade:12

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
10 years ago
The colour exhibited by the transition metal ions is due to their ability to absorb light in the visible region of the electromagnetic spectrum. This causes unpaired d electrons to rise from a lower to a higher energy state. Ions which have the electronic configuration 3d(10), including the Scandium (III) Ion, Sc(+++) and the Copper (I) Ion, Cu(+), are colourless, because they have no unpaired d electrons.
in [FeCl4]2- has no unpaired electron therefore it is colourless

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