Home
Class 11
CHEMISTRY
Would you expect the second electron gai...

Would you expect the second electron gain enthalpy of `O` as positive, more negative or less negative than the first? Justify your answer.

Text Solution

Verified by Experts

The second electron gain enthalpy of O is positive as explained below :
When an electron is added to O atom form `O^(-)` ion, energy is released. Thus first electron gain enthalpy of O is negative
`O ( g) + e^(-) (g) to O^(-) ( g) , Delta_(eg) H = - 141 kJ mol^(-1)`
But when another electron is added to `O^(-)` to form `O^(2-)` ion energy is absorbed to overcome the strong electrostatic repulsion between the negatively charged `O^(-)` ion and the second electron being added Thus the second electron gain enthalpy of oxygen is positive ,
`O^(-) ( g) + e^(-) (g) to O^(2-) ( g) , Delta_(eg) H = + 780 kJ mol^(-1)`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    PRADEEP|Exercise NCERT (EXEMPLAR PROBLEMS) (Multiple Choice Questions -I)|13 Videos

  • CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    PRADEEP|Exercise NCERT (EXEMPLAR PROBLEMS) (Multiple Choice Questions -II)|10 Videos

  • CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    PRADEEP|Exercise NCERT (Questions and exercise )(NCERT INTEXT SOLVED QUESTIONS)|10 Videos

  • CHEMICAL BONDING AND MOLECULAR STRUCTURE

    PRADEEP|Exercise Curiosity Questions|2 Videos

  • ENVIRONMENTAL CHEMISTRY

    PRADEEP|Exercise COMPETITION FOCUS (JEE(Main and Advanced)/Medical Entrance (VI.ASSERTION-REASON) Type II|6 Videos

Similar Questions

Explore conceptually related problems

Would you expect the second electron gain enthalpy of S as positive, more negative or less negative than the first? Justify your answer.

Why first electron gain enthalpy of sulphur is more negative then oxygen?

Knowledge Check

  • For which of the following, the second electron gain enthalpy has positive value?

    A
    O
    B
    S
    C
    Both of these
    D
    None of these

  • Why is the electron gain enthalpy of O or F less than that of S or Cl?

    A
    O and F are more electronegative than S and Cl.
    B
    When an electron is added to O or F,it goe to a smaller(n=2) level and suffers more repulsion than the electron in S or Cl in larger level(n=3)
    C
    Adding an electron to 3p-orbital leads to more rpulsion than 2p-orbital.
    D
    Electron gain enthalpy depends upon the electron affinity of the atom.

    • Similar Questions

    Explore conceptually related problems

    Explain why the electron gain enthalpy of the fluorine is less negative than that of chlorine

    " The electron gain enthalpy of "O" is less negative than that of "S" ."

    Why is the second electron gain enthalpy negative (i.e. energy is absorbed)?

    Electron gain enthalpies of halogens are largely negative. Explain.

    Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine.

    Electron gain enthalpy of fluorine (F) is less negative than that of chlorine (Cl). Why ?

    Home
    Profile