Question

a student is testing water to know which is best for cleansing purpose with soap . he would find that the cleansing action of soaps is best when he uses water obtained from 1)rain 2)tap 3) hand pump 4)pond

Answer 1

The answer is

(1)Rainwaterbecause it isdistilled waterwhich helps in formation of micelle and willbebestfor cleansing purpose with soap

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Answer 2

Answer:

The correct answer is (1) rain.

Explanation:

Soap exhibits its cleansing action in the best way with soft water. On the other hand, it does not lather well in hard water.

Tap water, pond water and hand pump water are all hard water as they contain a huge number of minerals. However, rainwater is considered to be soft as it contains lesser or zero number of minerals. Thereby, soap lathers well in rainwater.