Q.

In which of the following ionic compounds, ∆Hf is negative only due to lattice energy ?(i) NaF   (ii) MgO   (iii) Li3N   (iv) Na2S

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a

Only (iv)

b

Only (iii), (iv)

c

Only (ii), (iii), (iv)

d

All of these

answer is C.

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Detailed Solution

Formation of oxide, nitride and sulphide (S2-) is endothermic process while formation of flouride(F-) is exothermic process.
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In which of the following ionic compounds, ∆Hf is negative only due to lattice energy ?(i) NaF   (ii) MgO   (iii) Li3N   (iv) Na2S