Among the substances listed, potassium chloride salt is generally more soluble in cold water than in warm water.
In general, most salts and ionic compounds tend to decrease in solubility as temperature increases, but this can vary based on specific compounds. Oxygen gas, on the other hand, is less soluble in warm water than cold water. Sugar (sucrose) and sodium chloride typically have increased solubility with rising temperatures as well.
Thus, the best answer is potassium chloride salt.
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