Statement I NaF is more ionic than Na₂O
Statement II formation of O^-2from O^-1 is exothermic

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both statement I and statement II is incorrect

statement I is incorrect and statement II is correct

both statement I and statement II is correct

statement I is correct and statement II is incorrect

answer is A.

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Detailed Solution

Fluorine has more electronegativity than O, and according to Fajan's rule, the size should be small to have more ionic character. Thus NaF is more ionic.

But gaining one more electron to O₂ will mean much more stability, so it is be an exothermic reaction. This expectation is true if we consider a neutral species but as O^- is negligibly charged adding another negatively charged species will be difficult as the like charges will repel each other, so formation of O^2- from O^- is endothermic.

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