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The insoluble substance (scum) that forms when soap is used with hard water is caused by the reaction of soap with

Question
The insoluble substance (scum) that forms when soap is used with hard water is caused by the reaction of soap with
Sodium and potassium ions
Calcium and magnesium salts present in hard water
Chlorine gas
Dissolved oxygen
Answer
Calcium and magnesium salts present in hard water
Detailed Explanation
Scum forms because soap reacts with the calcium and magnesium salts responsible for water hardness.
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