Among the substances listed, oxygen gas is more soluble in cold water than in warm water.
Explanation:
- Gases: The solubility of gases in liquids generally increases with a decrease in temperature. Therefore, oxygen gas is more soluble in cold water than in warm water.
- Ionic compounds (sodium chloride, potassium chloride): The solubility of many salts, like sodium chloride and potassium chloride, typically increases with an increase in temperature.
- Sugar: The solubility of sugar (sucrose) also tends to increase with temperature.
Thus, the correct answer is oxygen gas.
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