Q70
jee_main_2024_31_jan_morning
Electron Gain Enthalpy
The correct sequence of electron gain enthalpy of the elements listed below is
A. Ar
B. Br
C. F
D. S
Choose the most appropriate from the options given below:
Solution
Core Logic
Electron gain enthalpy (ΔegH) values are considered with their signs when ordering from largest to smallest algebraically.
| Element | ΔegH (kJ/mol) |
|---|---|
| F | -333 |
| S | -200 |
| Br | -325 |
| Ar | +96 |
Arranging these algebraically from highest to lowest: +96 > -200 > -325 > -333 Thus, Ar > S > Br > F, which corresponds to A > D > B > C.
Pattern Recognition
Noble gases always have positive electron gain enthalpies (highest algebraically). Halogens have highly negative values (lowest algebraically). Fluorine is highly negative, Bromine is slightly less negative. Sulfur sits in between.
Chapter Mix
Class 11 Chemistry: Classification of Elements and Periodicity in Properties
