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(A) Lattice energy is inversely proportional to the inter-ionic distance $(r_+ + r_-)$ between the cation and the anion.As the size of the cation incr

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$MgO$

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(A) Lattice energy is inversely proportional to the inter-ionic distance $(r_+ + r_-)$ between the cation and the anion.As the size of the cation increases down the group $(Mg^{2+} Consequently,the lattice energy decreases as we move from $MgO$ to $BaO$.Therefore,$MgO$ has the smallest cation size,resulting in the shortest inter-ionic distance and the maximum lattice energy.

Among the following oxides,which has the maximum lattice energy?

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