11th Class Chemistry Chemical Bonding and Molecular Structure Question Bank 11th CBSE Chemistry Chemical Bonding and Molecular Structure

  • question_answer Out of H and \[{{H}_{2}},\] the latter has higher first ionization energy while out of \[O\] and \[{{O}_{2}},\] the former has higher first ionization energy. Explain why.

    Answer:

                    In \[{{H}_{2}},\] first electron has to be removed from \[\sigma (1s)\] which has lower energy (more stable) than H-atom. In \[{{O}_{2}},\] first electron has to be removed from \[{{\pi }^{*}}\,(2{{p}_{x}})\,or\,{{\pi }^{*}}\,(2{{p}_{y}})\] orbital which has higher energy than 2 p-orbital of O-atom.


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