A) CI < F < O < S
B) O < S < F < CI
C) F < S < O < CI
D) S < O < CI < F
Correct Answer: B
Solution :
Key Idea Electron gain enthalpy, generally, increases in a period from left to right and decreases in a group on moving downwards. However, members of III period have somewhat higher electron gain enthalpy as compared to the corresponding members of second period, because of their small size. O and S belong to VI A (16) group and Cl and F belong to VII A (17) group. Thus, the electron gain enthalpy of Cl and F is higher as compared to 0 and S. Cl and F > O and S Between Cl and F, Cl has higher electron gain enthalpy as in P, the incoming electron experiences a greater force of ?repulsion because of small size of F atom. Similar is true in case of O and S ie, the electron gain enthalpy of S is higher as compared to O due to its small size. Thus, the correct order of electron gain enthalpy of given elements is O < S < F < Cl
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