In which of the following processes is energy absorbed?

  • A
    $Cl + e^- \to Cl^-$
  • B
    $O^- + e^- \to O^{2-}$
  • C
    $O^{2-} - e^- \to O^-$
  • D
    $Na^+ + e^- \to Na$

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Electron affinity depends on

In which of the following cases will the maximum energy be released?

What will be the value of $\Delta H$ for the following process?
$X_{(g)} + e^- \to X^-_{(g)}$

Column-$I$ shows the electronic configuration of some elements and Column-$II$ shows the values of electron gain enthalpy. Match these values correctly. Match the electronic configuration with the electron gain enthalpy.
Column-$I$ Electronic Configuration Column-$II$ Electron Gain Enthalpy / $kJ \ mol^{-1}$
$(A) \ 1s^2 2s^2 2p^6$ $(1) -53$
$(B) \ 1s^2 2s^2 2p^6 3s^1$ $(2) -328$
$(C) \ 1s^2 2s^2 2p^5$ $(3) -141$
$(D) \ 1s^2 2s^2 2p^4$ $(4) +53$

In which of the following processes is energy released?

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