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प्रश्न
The chemical which is not required for the preparation of soap in the laboratory is:
(a) vegetable oil
(b) baking soda
(c) caustic soda
(d) common salt
उत्तर
baking soda
Baking soda is not required for the preparation of soap in the laboratory. For the preparation of soap, vegetable oil, caustic soda and common salt are needed.
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संबंधित 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
Fill in the following blank with suitable word:
The sodium salt of a long chain fatty acid is called .............
Fill in the following blank with suitable word:
............. is better than soap for washing clothes when the water is hard.
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
Distinguish between esterification and saponification reactions of organic compounds.
Give a scientific explanation.
Soap forms a precipitate in hard water.
Write an answer to the following question.
Name three chemicals responsible for the surface activity of various detergents.
Soaps were originally made from ______.
We are using ______ to remove strong stains on the clothes.
What are the similarities between Soap and synthetic detergent.
