What is the advantage of a detergent over soap ?
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Detergent are more soluble in water than soap and are unaffected by hardness of water as their calcium and magnesium salts are soluble in water so they do not form scum and cleaning action is easily done.
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State two ways, by which a saturated solution can be changed to unsaturated solution.
What is a soap, what is it used for?
What are hydrous substances? Explain with examples.
What is the importance of dissolved impurities in water ?