The equation used to represent the electron gain enthalpy is

  • A
    $X_{(g)} + e^{-} \longrightarrow X^{-}_{(g)}$
  • B
    $X_{(s)} + e^{-} \longrightarrow X^{-}_{(g)}$
  • C
    $X_{(g)} \longrightarrow X^{+}_{(g)} + e^{-}$
  • D
    $X_{(s)} \longrightarrow X^{+}_{(g)} + e^{-}$

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