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(C) The lattice energy of an ionic compound is directly proportional to the product of the charges of the ions and inversely proportional to the sum o

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$MgO$

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(C) The lattice energy of an ionic compound is directly proportional to the product of the charges of the ions and inversely proportional to the sum of the ionic radii.$Lattice \ Energy \propto \frac{|q_+ 	imes q_-|}{r_+ + r_-}$For $LiF$,$NaCl$,and $LiCl$,the ions have charges of $\pm 1$. For $MgO$,the ions have charges of $\pm 2$.Since the charge product for $MgO$ $(2 	imes 2 = 4)$ is significantly higher than that of the others $(1 	imes 1 = 1)$,$MgO$ has a much higher lattice energy.Additionally,$Mg^{2+}$ and $O^{2-}$ ions are relatively small,which further increases the lattice energy.Therefore,$MgO$ has the highest lattice energy.Hence,option $C$ is correct.

Among the following compounds,the one with the highest lattice energy is

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