Which of the following processes requires maximum energy

1. $\mathrm{M}\mathrm{g}\left(\mathrm{g}\right)\mathrm{ }⟶\mathrm{ }{\mathrm{M}\mathrm{g}}^{+}\left(\mathrm{g}\right)+{\mathrm{e}}^{–}$
2. ${\mathrm{M}\mathrm{g}}^{+}\left(\mathrm{g}\right)\mathrm{ }⟶{\mathrm{M}\mathrm{g}}^{+2}\left(\mathrm{g}\right)+{\mathrm{e}}^{–}$
3. $\mathrm{N}\mathrm{a}\left(\mathrm{g}\right)⟶\mathrm{ }{\mathrm{N}\mathrm{a}}^{+}\left(\mathrm{g}\right)+{\mathrm{e}}^{–}$
4. ${\mathrm{N}\mathrm{a}}^{+}\left(\mathrm{g}\right)⟶{\mathrm{N}\mathrm{a}}^{2+}\left(\mathrm{g}\right)+{\mathrm{e}}^{–}$

Solution

Asked in: JEE-TOPICTESTS-CHEMISTRY

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