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The formation of the oxide ion O 2 - ( g ) requires first, an exothermic and then, an endothermic step as shown below: O g + e - = O - g ;    ∆ H o = - 142   kJ   mol - 1 O - g + e - = O 2 - g ,   ∆ H o = 844   kJ   mol - 1 . This is because

Options

  1. AO - ion will tend to resist the addition of another electron.
  2. BOxygen has high electron affinity.
  3. COxygen is more electronegative.
  4. DO - ion has comparatively larger size than oxygen atom.

Correct answer

A. O - ion will tend to resist the addition of another electron.

Step-by-step solution

The addition of second electron to an atom or ion is always endothermic as the incoming electron experience a greater force of repulsion from the other electrons.

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