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प्रश्न
What are the differences between Soap and synthetic detergent?
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उत्तर
| Soap | Synthetic detergent | |
| 1. | Soaps are sodium salts of fatty acids (hard soap) or potassium salts of fatty acids (soft soap). | Synthetic detergents are made from raw materials such as fats or kerosene. |
| 2. | They can be used only with soft water. | They can be used with both soft and hard water. |
संबंधित प्रश्न
Why do soaps not form lather in hard water?
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
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.
Explain why soap cannot be used in hard water.
Water, coconut oil, and _______ are necessary for soap preparation.
Match the following
| 1. | Soap | C6H5 OH |
| 2. | Cement | CaSO4.2H2O |
| 3. | Fertilizers | NaOH |
| 4. | Gypsum | RCC |
| 5. | Phenol | NPK |
______ molecules go and join with dirt and oil in the cloth.
