Question

When the first electron gain enthalpy $\left({\Delta }_{eg}H\right)$ of oxygen is $-141kJ/mol$, its second electron gain enthalpy is:

• A. Almost the same as that of the first
• B. Negative, but less negative than the first
• C. A positive value
• D. A more negative value than the first

Answer 1

The correct option is C A positive value

Second electron gain enthalpy is always positive for every element.

$O^{-}\left(g\right)+e^{-}\to O^{-2}\left(g\right);\Delta H=positive$