JEE Main · ChemistryHard
Identify the correct statement regarding the electron gain enthalpy of the following elements: , , , .
- A.The electron gain enthalpy of is more negative than that of .
- B.The electron gain enthalpy of is more negative than that of .
- C.The electron gain enthalpy decreases in magnitude from to .
- D.The electron gain enthalpy of is the most negative among the group.
Show correct answer & step-by-step solution
Correct answer: B — The electron gain enthalpy of is more negative than that of .
Solution
- Electron gain enthalpy generally becomes less negative down the group due to the increase in atomic size.
- However, has an exceptionally small size, leading to strong inter-electronic repulsions when an electron is added to the orbital.
- Consequently, has a more negative electron gain enthalpy than .
- Hence the answer is (B).
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