Among the substances listed, potassium chloride salt is generally more soluble in cold water than warm water. While many solutes (including common salts like sodium chloride) tend to have increased solubility with rising temperatures, potassium chloride exhibits greater solubility at lower temperatures compared to higher temperatures.
On the other hand, sugars (like sugar powder) and sodium chloride typically dissolve better in warm water than in cold water. Oxygen gas, being a gas, also has decreased solubility in warmer water.
So, the correct response is potassium chloride salt.
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