Advertisements
Advertisements
प्रश्न
Explain why often coloured spots are formed on clothes during washing.
Advertisements
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
People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
Explain the formation of scum when hard water is treated with soap.
Why is soap not suitable for washing clothes when the water is hard?
A student takes 4 mL of distilled water in each of four test tubes I, II, III and IV, and then dissolves an equal amount of four different salts namely NaCl in I, CaCl2 in II, MgCl2 in III and KCl in IV. He then adds 8 drops of the given soap solution to each test tube and shakes the contents of the test tube 10 times. In which test tubes will enough lather (foam) be formed ?
(A) I and II
(B) II and III
(C) I and IV
(D) III and IV
Give a scientific explanation.
Soap forms a precipitate in hard water.
What is meant by ‘surface activity’?
What are the three main constituents of soap?
What are the two different types of molecules found in the soap?
We are using ______ to remove strong stains on the clothes.
______ to remove strong strains on the clothes.
