The correct order of electron affinity is:

F > C l > O

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F > O > C l

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C l > F > O

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O > F > C l

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Solution

The correct option is D $C l > F > O$
Electron affinity is the energy released when a neutral gaseous atom accepts an electron to form an anion. In a group electron affinity decreases as the added electron is far away from nucleus & hence loosely bound. But $F$ has lower electron affinity than $C l$ because of smaller size.
Also, electron affinity increases along a period.
$∴$ Correct order is $C l > F > O$
EA value of $C l = 348.5$
EA value of $F = 333$
EA value of $O = 141$

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