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प्रश्न
Fill in the following blank with suitable word:
............. is better than soap for washing clothes when the water is hard.
उत्तर
Detergent is better than soap for washing clothes when the water is hard.
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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
What is a detergent? Name one detergent.
Why have detergents replaced soap as a washing agent?
Explain the cleansing action of soap. Draw diagrams to illustrate your answer.
The chemical mostly used in the preparation of most of the soaps we use is
(a) Sodium chloride
(b) Potassium hydroxide
(c) Sodium hydroxide
(a) Potassium chloride
What is a soap?
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.
Explain why synthetic detergents are superior to soap.
Explain why often coloured spots are formed on clothes during washing.
The soap molecule has a
