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NEET Chemistry QUESTION #7393
Question 1
The correct order of electron gain enthalpy (with negative sign) for the atomic species F, Cl, O and S is:
  • \(\text{F} < \text{Cl} < \text{O} < \text{S}\)
  • \(\text{S} < \text{O} < \text{Cl} < \text{F}\)
  • \(\text{O} < \text{S} < \text{F} < \text{Cl}\)āœ”ļø
  • \(\text{Cl} < \text{F} < \text{S} < \text{O}\)
Correct Answer Explanation
Electron gain enthalpy trend:
O has lower EA than S (too small, high eā» repulsion). F has lower EA than Cl (same reason). Cl has the highest EA among these.

Correct order (increasing magnitude of negative EGE):
\(\text{O} < \text{S} < \text{F} < \text{Cl}\)

i.e., Cl releases most energy on gaining an electron.