A) \[Cl\]
B) \[I\]
C) \[F\]
D) \[Br\]
Correct Answer: B
Solution :
In a group the electron affinity decreases on moving downward because the size increases. \[\begin{align} & \text{Halogen:}\,\,\,\,\,\,\,\,\,\,F\,\,\,\,\,\,\,\,\,\,\,Cl\,\,\,\,\,\,\,\,\,\,\,\,\,\,Br\,\,\,\,\,\,\,\,\,\,\,\,\,\,1 \\ & EA(eV):\,\,\,\,\,\,-3.6\,\,\,\,\,\,-3.8\,\,\,\,\,\,\,-3.5\,\,\,\,\,\,-3.2 \\ \end{align}\] The low value of electron affinity of fluorine than chlorine is due to its small size.
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