The correct order of electron gain enthalpy (\( - \) ve value) is :
The correct order of electron gain enthalpy (\( - \) ve value) is :
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- O > S > Se > Te
- O < S < Se < Te
- O < S > Se > Te
- O < S > Se < Te
The Correct Option is C
Solution and Explanation
Step 2: Oxygen is anomalous: its very small size and strong inter-electronic repulsion in the compact 2p subshell make its \(\Delta_{eg}H\) less negative than that of S.
Step 3: Approximate values (kJ mol\(-1\)): O \(-\)141, S \(-\)200, Se \(-\)195, Te \(-\)190. Order: O < S > Se > Te.
Answer: (C) O < S > Se > Te
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