1. Tardigrade
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  3. Chemistry
  4. When the first electron gain enthalpy ( ΔegH) of oxygen is -141 kJ/mol, its second electron gain enthalpy is :

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

JEE MainJEE Main 2019Classification of Elements and Periodicity in Properties

Solution:

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