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प्रश्न
Explain why often coloured spots are formed on clothes during washing.
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उत्तर
The laundry, skincare, beauty, and personal hygiene products that we use commonly can cause stains and color changes in our clothes. Toothpaste, perspiration, facial soap, deodorants, hair sprays, strong perfumes with alcohol, and even rain are often the causes of stains on garments. All these stains may eventually dry up, not causing any visible stain; however, age and exposure to heat will cause them to reappear.
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
Fill in the following blank with suitable word:
............. is better than soap for washing clothes when the water is hard.
What change will you observe if you test soap solution with a litmus paper (red and blue)? Give reason for your observation.
Use of synthetic detergents causes pollution of water.
Why is common salt (sodium chloride) added during the preparation of soap?
The soap molecule has a ______.
Which one of the following sets of materials can be used to prepare soap?
(A) Neem oil and calcium hydroxide
(B) Castor oil and sodium hydroxide
(C) Mineral oil and sodium hydroxide
(D) Neem oil and magnesium hydroxide
What are the differences between Bath soap and soap for washing clothes?
Soaps were originally made from ______.
Why do soaps not work effectively in hard water?
