(a) C.F. for water > A.F. for water and oil (b) C.F. for oil > A.F. for water and oil (c) C.F. for oil < A.F. for water and oil (d) None of the above Ans. a (31)
(a) Chemicals of soap change (b) It increases the surface tension of the solution (c) It absorbs the dirt (d) It lowers the surface tension of the solution Ans. (d) Soap helps to lower the surface tension of solution, thus …