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Chemistry Question on Classification

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

a positive value

Explanation

Solution

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