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Q.

The gaseous flourine is pale yellow in colour. The light absorbed by fluorine in the visible region would be

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a

orange light

b

violet light

c

red light

d

green light

answer is A.

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Detailed Solution

The nucleus of fluorine exhibits the strongest attraction to the surrounding electrons while being the smallest member of the group. It consequently needs a lot of excitation energy, absorbs violet light (which has a lot of energy), and appears pale yellow as a result.

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