Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

CI < F < O < S

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O < S < F < Cl

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F < S < O < Cl

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S < O < Cl < F

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Solution

The correct option is C O < S < F < Cl
The electron gain enthalpy (EA) of elements increases along a period towards right. Also it decreases down the group. However the EA of Cl is higher than that of F and EA of S is higher than that of O as F and O are very small in size. Thus the correct order of EA is
$O < S < F < C l$

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