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प्रश्न
A student is testing water to know which is best for cleansing purposes with soaps. He would find that the cleansing action of soaps is best when he uses water obtained from
(a) rain
(b) tap
(c) hand pump
(d) pond
उत्तर
Rain does not conatin any such salts that cause hadeness of water. So, among the given sources of water, rain would show best cleansing action of soaps.
Hence, the correct answer is option (a).
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संबंधित प्रश्न
While preparing soap a small quantity of common salt is generally added to the reaction mixture of vegetable oil and sodium hydroxide. Which one of the following may be the purpose of adding common salt?
(A) To reduce the basic nature of the soap
(B) To make the soap neutral
(C) To enhance the cleansing power of the soap
(D) To favour the precipitation of the soap
What is a detergent? Name one detergent.
Explain the action of soap in removing an oily spot from a piece of cloth.
Distinguish between esterification and saponification reactions of organic compounds.
What is meant by 'surface activity'?
What are the differences between Bath soap and soap for washing clothes?
The alkaline hydrolysis of fatty acids is termed as ______
______ to remove strong strains on the clothes.
Why do soaps not work effectively in hard water?
What are the similarities between Soap and synthetic detergent.
