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The formation of the oxide ion O2–(g) requires first an exothermic and then an endothermic step as shown below:
This is because:
  • a)
    O ion has comparat ively larger size than oxygen atom
  • b)
    Oxygen has high electron affinity
  • c)
    O ion will tend to resist the addition of another electron
  • d)
    Oxygen is more electronegative
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The formation of the oxide ion O2–(g) requires first an exotherm...
O undergoes electron affinity with exothermic reaction in first step and the energy is released. So, the electron gain enthalpy is negative.

In case of O-, addition of electron requires addition of energy and undergoes endothermic reaction due to electron repulsion. So, the electron gain enthalpy is positive.

And the maximum number of electrons makes repulsion and there is resistance to add extra electron.

So the correct answer is option C.
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Community Answer
The formation of the oxide ion O2–(g) requires first an exotherm...
Bcoz after gain of one more electron oxygen have noble gad configuration
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The formation of the oxide ion O2–(g) requires first an exothermic and then an endothermic step as shown below:This is because:a)O– ion has comparat ively larger size than oxygen atomb)Oxygen has high electron affinityc)O– ion will tend to resist the addition of another electrond)Oxygen is more electronegativeCorrect answer is option 'C'. Can you explain this answer?
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The formation of the oxide ion O2–(g) requires first an exothermic and then an endothermic step as shown below:This is because:a)O– ion has comparat ively larger size than oxygen atomb)Oxygen has high electron affinityc)O– ion will tend to resist the addition of another electrond)Oxygen is more electronegativeCorrect answer is option 'C'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about The formation of the oxide ion O2–(g) requires first an exothermic and then an endothermic step as shown below:This is because:a)O– ion has comparat ively larger size than oxygen atomb)Oxygen has high electron affinityc)O– ion will tend to resist the addition of another electrond)Oxygen is more electronegativeCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The formation of the oxide ion O2–(g) requires first an exothermic and then an endothermic step as shown below:This is because:a)O– ion has comparat ively larger size than oxygen atomb)Oxygen has high electron affinityc)O– ion will tend to resist the addition of another electrond)Oxygen is more electronegativeCorrect answer is option 'C'. Can you explain this answer?.
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