Question
Halogens are strong oxidising agents. Why?
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Answer
The electron affinity of halogens is maximum among all the groups. Higher is electron affinity, more is the tendency to gain electron and thus more is the tendency to get itself reduced and more is oxidizing power.
$ X + e \rightarrow X^{-} $
$ \Delta H = -EA $ (higher values)
$ X + e \rightarrow X^{-} $
$ \Delta H = -EA $ (higher values)
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