Question

The cleaning action of soap will be the most in the water obtained from the source: (a) Tap (b) Rain (c) Well (d) Hand pump

Answer 1

b)rain because the soap can give more lather in pure water.The rain water is the best source of pure water among the given options.

Answer 2

The answer is B) Rain water  ; when can get (almost)  pure form of water from the rain water; since Tap , well and Handpump water contains Calcium(Ca²⁺) and Magnesium(Mg²⁺) ions These binds with the soap molecule forming insoluble soap dirt (lime soap) , which results in wastage and decrease in action of soap. literally, Rain water due to absence of Ca and Mg ions is termed Soft water.