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PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 3 Classification of Elements and Periodicity in Properties1 Mark
Question
Would you expect the second electron gain enthalpy of $O$ as positive, more negative or less negative than the first? Justify your answer.
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Answer

The second electron gain enthalpy of oxygen is positive because when one electron is added to O $( g ), O ( g )^{-}$is formed and when an electron is added to $O ^{-}( g )$ again, there is repulsion between $O ( g )$ and incoming electron, due to which energy is absorbed.
$O _{( g )}^{-}+ e \rightarrow O _{( g )}^{-2} \Delta H =\Delta_{ cg _2}=+ ve$

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