The lattice energy of $C a O$ (s) is -3460 kJ mol $^{- 1}$ ; the lattice energy of $K_{2} O$ is -2240 kJ mol $^{- 1}$ . This difference is because $K^{+} > C a^{2 +}$ (size), $K^{+} < C a^{2 +}$ (charge).
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Solution

$O^{2 -}$ is identical, polarising power of $K^{+} < C a^{2 +}$ thus, $K_{2} O$ is more ionic than $C a O$ thus, lattice energy of $C a O > K_{2} O$

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