All the halogens are coloured. The colours arise due to

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Absorption of light in the visible region due to excitation of electron from HOMO to LUMO

strong oxidizing power of the halogens

weak van der Waals forces between the halogen molecules

Emission of light due to transfer of an electron from a higher state to the ground state

answer is C.

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Detailed Solution

Halogens are coloured because the electron gets excited by absorbing visible region of light. Reflected light thus impart the complimentary colour to the molecule.

On moving from fluorine to iodine, the atomic radii increases, so the energy levels becomes closer and the low energy light is absorbed and colour deepens on moving down the group

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