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

1. Cl < F < O < S
2. O < S < F < Cl
3. F < S < O < Cl
4. S < O < Cl < F

Correct answer: O < S < F < Cl

Solution

Electron gain enthalpy becomes more negative as we move down a group due to increased atomic size and shielding effect, except for fluorine, which has less negative electron gain enthalpy than chlorine due to its small size and high electron-electron repulsion. Thus, the correct order is O < S < F < Cl.

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