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प्रश्न
While studying the saponification reaction, what do you observe when you mix an equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in a beaker?
(A) The colour of the mixture has become dark brown
(B) A brisk effervescence is taking place in the beaker
(C) The outer surface of the beaker has become hot
(D) The outer surface of the beaker has become cold
उत्तर
While studying saponification reaction, when equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in mixed in a beaker, the beaker becomes hot. This is because, saponification is an exothermic reaction.
Hence, the correct answer is option The outer surface of the beaker has become hot.
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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
Would you be able to check if water is hard by using a detergent?
A student took four test tubes P, Q, R and S and filled about 8 mL of distilled water in each. After that he dissolved an equal amount of Na2SO4 in P, K2SO4 in Q, CaSO4 in R and MgSO4 in S. On adding an equal amount of soap solution and shaking each test tube well, a good amount of lather will be obtained in the test tubes:
(a) P and Q
(b) P and R
(c) P, Q and S
(d) Q, R and S
Distinguish between esterfication and saponification reaction with the help of the chemical equations for each.
Fill in the following blank with suitable word:
The sodium salt of a long chain fatty acid is called .............
State one advantage of soaps over detergent.
Give any two differences between soaps and detergents.
Describe the structure of a soap molecule with the help of a diagram.
Give a scientific explanation.
Soap forms a precipitate in hard water.
What are the three main constituents of soap?
