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Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?A. `Cl lt F lt S lt O`B. `S lt O lt Cl lt F`C. `O lt S lt F lt Cl`D. `F lt Cl lt O lt S`

Answer» Correct Answer - C
Halogens have very high electron affinity. It may be rated that the electrons affinity of fluorine is unexpectedly low `(lt Cl)`. This may perheps be due to small size of `F` atom. The value of electron gain enthalpies for `Cl, F, S` and `O` are respectively `349,333,200` and `142 kJ//mol` hence correct order is `Cl gt F gt S gt O`.


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