Question
Question: Which of the following arrangements represents the correct order of electron gain enthalpy?...
Which of the following arrangements represents the correct order of electron gain enthalpy?
A
O < S < F < Cl
B
Cl < F < S < O
C
S < O < Cl < F
D
F < Cl < O < S
Answer
O < S < F < Cl
Explanation
Solution
: Electron gain enthalpy becomes more negative across a period while it becomes less negative in a group. However, electron gain enthalpy of O or F is less than that of the succeeding element. When electron is added to n = 2, the repulsion is more than when it is added to n = 3 in case of Cl or S.