The correct answer is BaS > CsCl.
BaS > CsCl, larger charge on cation and /or on anion larger lattice enregy.
What is lattice energy?
The energy needed to split a mole of an ionic solid into gaseous ions is referred to as lattice energy. Lattice energy is also influenced by the size of the ions. We can argue that the distance between the ion nuclei reduces as the size of the anion (negative ion) or cation (positive ion) rises. Ion attraction will be reduced as a result, which will reduce lattice energy. As a result, as ion size grows, lattice energy declines.
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