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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Assertion $(A)$: Fluorine has a smaller negative electron gain enthalpy than chlorine.
Reason $(R)$: The electron-electron repulsion is higher in chlorine than in fluorine.

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