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 O and S. Cl and F>O and S Between Cl and F,Cl has higher electron gain enthalpy as in F, 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
Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ?
NEET UG 2010 — Chemistry Inorganic Chemistry
Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O,S,F and Cl ?
Held on 30 Apr 2010 · Verified 9 Jul 2026.
Options
- A
Cl<F<O<S
- B
O<S<F<Cl
- C
F < S <O<Cl
- D
S <O<Cl<F
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