Question

The formation of the oxide ion ${{\rm{O}}^{2 - }}\left( {\rm{g}} \right)$ requires first an exothermic and then an endothermic step as shown below ${\rm{O}}\left( {\rm{g}} \right) + {e^ - } = {{\rm{O}}^ - }\left( {\rm{g}} \right);{\rm{\;\;}}\Delta {H^o} = - 142{\rm{\;kJ\;mo}}{{\rm{l}}^{ - 1}}$ , ${{\rm{O}}^ - }\left( {\rm{g}} \right) + {e^ - } = {{\rm{O}}^{2 - }}\left( {\rm{g}} \right),{\rm{\;}}\Delta {H^o} = 844{\rm{\;kJ\;mo}}{{\rm{l}}^{ - 1}}$ This is because

Accepted Answer

${{\rm{O}}^ - }$ ion will tend to resist the addition of another electron

Answer

Oxygen has high electro affinity

Answer

Oxygen is more electronegative

Answer

${{\rm{O}}^ - }$ ion has comparatively larger size than oxygen atom

NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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