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← ScienceWhich mechanism causes hygroscopic ionic solids, like calcium chloride, to deliquesce in humid air?
A)Exothermic dissolution lowers vapor pressure✓
B)Oxidation reactions create volatile byproducts
C)Capillary condensation concentrates the salt
D)Hydrolysis generates strong acids
💡 Explanation
When a hygroscopic ionic solid is exposed to humid air, exothermic dissolution occurs because hydration enthalpy released when the solid dissociates into ions in a thin layer of adsorbed is higher than lattice energy causing the vapor point get reduces. Thus lowering the water vapour in immediate surroundings. Therefore calcium chloride dissolved causing deliquescence, solubility results, rather oxidation byproducts that can volatilized.
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