Question

The cleaning capacity of soap is maximum in-
a) Tap water b) Hand pump water
c) Rain water d) Tube well water​

Answer 1

Soap solution in test tube P produces the maximum length of foam. Thus, distilled water (soft water) has the most cleansing capability. Soap solution in test tube 0 produces smaller length of foam as compare to test tube P. Thus, underground water has less cleansing capability than soft water.

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