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प्रश्न
What is meant by ‘surface activity’?
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उत्तर
The surface activity of a substance is the property by virtue of which it can spread on a surface. For example, soapy water easily spreads on any kind of surface and thus is used for cleaning purposes.
संबंधित प्रश्न
In a locality, hard water, required for an experiment, is not available. However, the following salts are available in the school laboratory:
1. Sodium sulphate
2. Calcium sulphate
3. Magnesium chloride
4. Sodium chloride
5. Calcium chloride
6. Potassium sulphate
Which of the above salts may be dissolved in water to obtain hard water for the experiment?
(A) 2, 3 and 5
(B) 1, 2 and 5
(C) 1, 2, 4 and 6
(D) 3 and 5 only
Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction.
What change will you observe if you test soap solution with a litmus paper (red and blue)? Give reason for your observation.
State one advantage of soaps over detergents.
Why is soap not suitable for washing clothes when the water is hard?
What is the difference between the chemical composition of soaps and detergents? State in brief the action of soaps in removing an oily spot from a shirt. Why are sops not considered suitable for washing where water is hard?
Why are soaps not suitable for washing clothes when the water is hard?
Name three chemicals responsible for the surface activity of various detergents.
The alkaline hydrolysis of fatty acids is termed as ______
Why do soaps not work effectively in hard water?
