COMEDK · Chemistry · 3. Classification of Elements and Periodicity in Properties
Which of the following species has lowest ionisation enthalpy?
- A Q
- B \(\mathrm{O}_2\)
- C \(\mathrm{O}_2^{+}\)
- D \(\mathrm{O}_2^{-}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{O}_2^{-}\)
Step-by-step Solution
Detailed explanation
During addition of electron to \(\mathrm{O}_2\) to form \(\mathrm{O}_2^{-}\), the additional \(\pi\)-molecular electron is added to the less stable antibonding orbital. Therefore, it is easier to remove an electron from \(\mathrm{O}_2^{-}\) ion to form a neutral \(\mathrm{O}_2\)…
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