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A student is testing water to know which is best for cleansing purposes with soaps.He would find that the cleansing action of soaps is best when he uses

water obtained from a)rain b)tap c)hand pump d)pond.


Depends what is mix with water and its amount , mainly it is called as hard water and it is consist of  calcium, magnesium and manganese , there amount in water will decide how much it is best for cleaning process with soap
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