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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
A student takes about 4 ml of distilled water in four test tubes marked P, Q, R and S. He then dissolves in each test tube an equal amount of one salt in one test tube, namely sodium sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. After that he adds an equal amount of soap solution in each test tube. On shaking each of these test tubes well, he observes a good amount of lather (foam) in the test tube marked
(A) P and Q
(B) Q and R
(C) P, Q and S
(D) P, R and S
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
State one use of esterfication process.
Fill in the following blank with suitable word:
............. is better than soap for washing clothes when the water is hard.
Give any two differences between soaps and detergents.
What is saponification? Write the chemical equation of the reaction involved in this process. Name all the substances which take part in this process and also those which are formed.
Give the reason of formation of scum when soaps are used with hard water.
Give a scientific explanation.
Soap forms a precipitate in hard water.
Soaps are ester of which type of acids?
______ molecules go and join with dirt and oil in the cloth.
