Which of the following transformations requir | vedclass

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(B) The energy required for the process $X^{-}_{(g)} 	o X_{(g)} + e^-$ is equal to the magnitude of the electron affinity (or electron gain enthalpy)

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$P^{-}_{(g)} 	o P_{(g)} + e^-$

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(B) The energy required for the process $X^{-}_{(g)} 	o X_{(g)} + e^-$ is equal to the magnitude of the electron affinity (or electron gain enthalpy) of the atom $X$.Let us consider the electron gain enthalpy process for each: $(a) \, F_{(g)} + e^- 	o F^{-}_{(g)} \, (\Delta H_1)$$(b) \, P_{(g)} + e^- 	o P^{-}_{(g)} \, (\Delta H_2)$$(c) \, S_{(g)} + e^- 	o S^{-}_{(g)} \, (\Delta H_3)$$(d) \, Cl_{(g)} + e^- 	o Cl^{-}_{(g)} \, (\Delta H_4)$The energy released during electron gain follows the order: $|\Delta H_4| (Cl) > |\Delta H_1| (F) > |\Delta H_3| (S) > |\Delta H_2| (P)$.Since the energy required for the reverse process is equal to the energy released in the forward process,the transformation requiring the least energy is the one with the lowest electron gain enthalpy magnitude,which is $P^{-}_{(g)} 	o P_{(g)} + e^-$.

Column-$I$ Electronic Configuration	Column-$II$ Electron Gain Enthalpy / $kJ \ mol^{-1}$
$(A) \ 1s^2 2s^2 2p^6$	$(1) -53$
$(B) \ 1s^2 2s^2 2p^6 3s^1$	$(2) -328$
$(C) \ 1s^2 2s^2 2p^5$	$(3) -141$
$(D) \ 1s^2 2s^2 2p^4$	$(4) +53$

Which of the following transformations requires the least amount of energy?

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