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Which of the following is coloured ?...

Which of the following is coloured ?

A

`V_(2)O_(5)`

B

`NbF_(5)`

C

`TaF_(5)`

D

`TaCI_(5)`

Text Solution

Verified by Experts

The correct Answer is:
A
Colour in transition metal compounds very commonly arises from d-d electronic transition. It can also ion by + ve ion and form charge transfer spectra. For Group 5 transition metals, the `(+5)` state has a `d^(0)` configuration and so colourless compounds would be expected. `NbF_(5)`, `TaCI_(5)` are white, but `V_(2)O_(5)` is red or orange, `NCI_(5)` is yellow, `NbBr_(5)` is orange and `NbI_(3)` is brass coloured. The colours airse because of change transfer.
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