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NEET Sample Paper NEET Sample Test Paper-77

  • question_answer
    Electron gain enthalpy increases across the period and decreases down the group. Which of the following order of electron gain enthalpy is correct?

    A)  \[F < Cl < Br < l\]       

    B)  \[F < Cl > Br > l\]

    C)  \[I > Br > F < Cl~\]    

    D)  \[\operatorname{I} < Cl < Br > F\]

    Correct Answer: B

    Solution :

    As we know electron gain enthalpy decreases down the group. Hence, the order should be \[\operatorname{F} > Cl > Br > I\] but correct order of electron gain enthalpy is \[\operatorname{F} < Cl > Br > I\] due to small size of F-atom. It requires high energy to become \[{{F}^{\Theta }}\] by accepting electron.


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