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Which of the following is the correct order of lattice energy

$\begin{array}{1 1}(a)\;LiF < MgS < CaF_2&(b)\;LiF < CaF_2 < MgS\\(c)\;MgS < LiF < CaF_2 &(d)\;CaF_2 < LiF < MgS\end{array}$

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$Li ^+F^-(=-240) < Ca^{2+}F_2^-(=-623) < Mg^{2+}S^{2-}(=-777)$
Hence (b) is the correct answer.
answered Mar 5, 2014 by sreemathi.v
 

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