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(B) The electron affinity of halogens generally decreases down the group due to an increase in atomic size and electron-electron repulsion.However,$Cl

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$I < Br < Cl$

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(B) The electron affinity of halogens generally decreases down the group due to an increase in atomic size and electron-electron repulsion.However,$Cl$ has a higher electron affinity than $F$ due to its larger size reducing inter-electronic repulsion.The order of electron affinity for halogens is $I Therefore,for the given elements $Cl, Br$ and $I$,the increasing order is $I < Br < Cl$.

The increasing order of electron affinity for $Cl, Br$ and $I$ is .....

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