In which of the following ionic compounds, \( \Delta \mathrm{H}_{f}...

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In which of the following ionic compounds, \( \Delta \mathrm{H}_{f} \) is negative only due to lattice energy?
(i) \( \mathrm{NaF} \)
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(ii) \( \mathrm{MgO} \)
(iii) \( \mathrm{Li}_{3} \mathrm{~N} \)
(iv) \( \mathrm{Na}_{2} \mathrm{~S} \)
(a) Only (iv)
(b) Only (iii), (iv)
W
(c) Only (ii), (iii), (iv)
(d) All of these
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