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प्रश्न
Why have detergents replaced soap as a washing agent?
उत्तर
Detergents have replaced soap as a washing agent because they do not form insoluble calcium and magnesium salts (scum) in hard water. Solubility of detergents, even in hard water, is better than a soap. Detergents also froth well.
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संबंधित प्रश्न
In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following group of salts available in your school, a group each member of which, if dissolved in distilled water, will make it hard:
(a) Sodium chloride, calcium chloride
(b) Potassium chloride, sodium chloride
(c) Sodium chloride, magnesium chloride
(d) Calcium chloride, magnesium chloride
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
Explain the process of preparation of soap in laboratory.
In a soap micelle, the soap molecules are arranged radially with:
(a) ionic ends directed towards the centre and hydrocarbon ends directed outwards
(b) hydrocarbon ends directed towards the centre and ionic ends directed outwards
(c) both ionic ends and hydrocarbon ends directed toward the centre
(d) both hydrocarbon ends and ionic ends directed outwards
Answer the following question.
In three test tubes A, B, and C, three different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap Answer is added to each test tube and the contents are shaken. In which test tube will the length of the foam (lather) be longest? Justify your answer.
Soap is a salt of ______ and sodium hydroxide.
The saponification of a fat or oil is done using _____ solution for hot process.
Soaps are ester of which type of acids?
Analogy:
Used to join components: Adhesives:: Clean the body ______.
______ are substances which can undergo chemical changes to produce certain materials.
