Which of the following compound is insoluble in water?

Calcium salt of stearic acid

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Calcium salt of heptadecanesulphonic acid

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Magnesium salt of lauryisulphonic acid

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Potassium salt of palmitic acid

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Solution

The correct option is A Calcium salt of stearic acid
Calcium stearate, which is also known as soap scum is insoluble in water. Due to the formation of calcium and magnesium stearate in hard water, soap does not dissolve in hard water.

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