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JEE Main & Advanced JEE Main Paper (Held On 09-Jan-2019 Evening)

  • question_answer
    When the first electron gain enthalpy \[\left( {{\Delta }_{eg}}H \right)\] of oxygen is \[-141\text{ }kJ/mol\], Its second electron gain enthalpy is: [JEE Main Online Paper (Held On 09-Jan-2019 Evening]

    A) a positive value

    B) a more negative value than the first

    C) almost the same as that of the first

    D) negative, but less negative than the first

    Correct Answer: A

    Solution :

    Second elecrtron gain enthalpy is always positive for every element due to repulsion between some charge. \[O\left( g \right)+\,\,1{{e}^{-}}\,\,\to \,\,{{e}^{-}}\left( g \right)\text{ }\Delta {{H}_{e{{g}^{-}}}}-141\text{ }kJ/mol\] \[{{O}^{-}}(g)+1{{e}^{-}}\to {{O}^{-2}}(g)\,\,\Delta H=\oplus ve\]


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