People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
A soap molecule has two parts: hydrophobic head and hydrophilic tail. With the help of these, it attaches to the grease or dirt particle with the hydrophobic end of the soap molecule and forms a cluster around dirt called micelles. These micelles remain suspended as a colloid. To break these micelles (entrapping the dirt), it is necessary to agitate clothes.
Match the terms of Column (A) with those of Column (B)
| Column (A) | Column (B) |
|---|---|
|
(a) Olfactory receptors |
(i) Tongue (ii) Eye (iii) Nose (iv) Skin |
Match the words of Column (A) with that of Column (B)
| Column (A) | Column (B) |
|---|---|
|
(a) Phloem |
(i) Excretion |
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Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 5 , Question 2: People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat&rsq....
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