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Electron Affinity

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Question

The electron affinity values $(i n k J m o l^{- 1})$ of three halogens x, y and z are respectively -349, -333 and -325. Then x, y and z are respectively

A

F_{2}, C l_{2} a n d B r_{2}

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B

C l_{2}, F_{2} a n d B r_{2}

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C

C l_{2}, B r_{2} a n d F_{2}

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D

B r_{2}, C l_{2} a n d F_{2}

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Solution

The correct option is B $C l_{2}, F_{2} a n d B r_{2}$
Generally electron affinity decreases down the group but $F_{2}$ has a lower electron affinity compared to $C l_{2}$ because the size of $F_{2}$ is very small and hence interelectronic repulsion is high.

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