For the process
$A_{(g)} + e^- \to A^{-}_{(g)};$ $\Delta H = x$
and $A^{-}_{(g)} \to A_{(g)} + e^-;$ $\Delta H = y$
Select the correct statement:

  • A
    Ionisation energy of $A^{-}_{(g)}$ is $y$
  • B
    Electron affinity of $A_{(g)}$ is $x$
  • C
    $-x = y$
  • D
    All are correct statements

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Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

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$A = 1s^2\, 2s^2\, 2p^4$,$B = 1s^2\, 2s^2\, 2p^5$,$C = 1s^2\, 2s^2\, 2p^6$. $A, B$ and $C$ are atoms/anions of the same element. Which one is correct? (One of $A/B/C$ is a neutral atom)

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