5. Soap helps in cleaning clothes, because
(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 soap get stick to the dust particles and grease and these are removed by action of water.
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a