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Question

Which terms are exothermic for the formation of NaF(s)?

I. Na(g)Na+(g)+e
II. F(g)+eF(g)
III. Na+(g)+F(g)NaF(s)

A
I only
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B
II only
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C
I and III only
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D
II and III only
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Solution

The correct option is D II and III only
The first term indicates the ionization energy which is endothermic and has a positive value.
The second term indicates electron affinity which is exothermic and has a negative value.
The third term indicates lattice enthalpy which is exothermic and has a negative value.

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