Why are halogens coloured?

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Solution

Halogens are coloured due to absorption of radiations in visible region.It results in excitation of valence electrons to higher energy level. As different halogens absorb different quanta of radiation, they dispaly different colours. Different colours of halogens are :

$\begin{matrix} F l u o r i n e & - & Y e l l o w C h l o r i n e & - & G r e e n i s h Y e l l o w B r o m i n e & - & R e d I o d i n e & - & V i o l e t \end{matrix}$

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