Question

When the first electron gain enthalpy $( \Delta_{eg}H) $ of oxygen is $-141\, kJ/mol$, 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

Second electron gain enthalpy is always positive for every element.
${O^{-} \, _{(g)} + e^{-} -> O^{-2} \, _{(g)} ; \Delta H = positive}$