Which of the following transformations requires the least amount of energy?
- A$F^{-}_{(g)} \to F_{(g)} + e^-$
- B$P^{-}_{(g)} \to P_{(g)} + e^-$
- C$S^{-}_{(g)} \to S_{(g)} + e^-$
- D$Cl^{-}_{(g)} \to Cl_{(g)} + e^-$
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Electron affinity depends on
Easy
View SolutionThe formation of the oxide ion,$O^{2-}_{(g)}$ from an oxygen atom requires first an exothermic and then an endothermic step as shown below:
$O_{(g)} + e^- \to O^{-}_{(g)} ; \Delta_f H^o = -141 \ kJ \ mol^{-1}$
$O^{-}_{(g)} + e^- \to O^{2-}_{(g)} ; \Delta_f H^o = +780 \ kJ \ mol^{-1}$
Thus,the process of formation of $O^{2-}$ in the gas phase is unfavourable even though $O^{2-}$ is isoelectronic with neon. This is due to the fact that,
$O_{(g)} + e^- \to O^{-}_{(g)} ; \Delta_f H^o = -141 \ kJ \ mol^{-1}$
$O^{-}_{(g)} + e^- \to O^{2-}_{(g)} ; \Delta_f H^o = +780 \ kJ \ mol^{-1}$
Thus,the process of formation of $O^{2-}$ in the gas phase is unfavourable even though $O^{2-}$ is isoelectronic with neon. This is due to the fact that,
In which of the following processes is energy liberated?
Medium
View SolutionIn comparison with alkali metals,the electron affinity of halogens is
Easy
View SolutionIn which of the following processes is energy absorbed?
Medium
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