AIPMT PRELIMS 2005 Chemistry Electron Gain Enthalpy MCQ Question
Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?
Cl < F < S < O
O < S < F < Cl
S < O < Cl < F
F < Cl < O < S
Correct Answer
Detailed Explanation
The electron gain enthalpy becomes more negative across a period from left to right. Oxygen and sulfur have less negative electron gain enthalpy than fluorine and chlorine due to their smaller size and higher effective nuclear charge.
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