Which of the following has maximum lattice energy?

L i_{2} O

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N a_{2} O

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M g O

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B a O

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Solution

The correct option is C $M g O$
The lattice energy depends on the attraction between the oppositely charged ions.

$L a t t i c e e n e r g y \propto \frac{o x i d a t i o n s t a t e o f i o n s}{s i z e o f i o n s}$

(+2) oxidation state containing ions have more lattice energy and also ionic size of the given metal ion follows the order: $B a^{2 +} > N a^{+} > L i^{+} > M g^{2 +}$

$M g^{2 +}$ ion is smallest in size and thus has highest lattice energy.

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