CaO has larger lattice enegrgy.
The quantity of energy released by the electrostatic attraction of oppositely charged ions is known as lattice energy (L.E). The ion's size and charge affect the lattice energy. lattice energy is inversely proportional to size of ion and directly proportional to charge of the ion.in this case the charge of the both compound is same +2 and -2 so oxygen is smaller in size compared to sulfur so Cao has larger lattice energy.
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