The lattice energies of the oxidies of $M g, C a, S r$ and $B a$ follow the order:

B a O > S r O > C a O > M g O

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C a O > B a O > S r O > M g O

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M g O > S r O > C a O > B a O

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M g O > C a O > S r O > B a O

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Solution

The correct option is D
$M g O > C a O > S r O > B a O$

The lattice energies of the oxidies of $M g, C a, S r$ and $B a$ follow the order $M g O > C a O > S r O > B a O$
On moving down the group, the lattice enthalpy decreases as the ionic size increases.This is due to the fact that atomic radius increases during downward movements. It should also be noted that lattice energy increases with an increase in the magnitude of the charge. It's true for both positive and negative charges.

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