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प्रश्न
- Write the formula and draw electron dot structure of carbon tetrachloride.
- What is saponification? Write the reaction involved in this process.
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उत्तर
- The formula for carbon tetrachloride is CCl4.
- When an ester is treated with an alkali, it gives alcohol and sodium ethanoate (sodium salt of carboxylic acid).
\[\ce{CH3COOC2H5 \overset{NaOH}{->}C2H5OH + CH3COONa}\]
This reaction is known as saponification because it is used in the preparation of soap.
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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
Which of the following sets of materials can be used for conducting a saponification reaction for the preparation of soap?
(a) Ca(OH)2 and neem oil
(b) NaOH and neem oil
(c) NaOH and mineral oil
(d) Ca(OH)2 and mineral oil
Hard water is not available for an experiment. Some salts are given below :
(I) Sodium chloride
(II) Sodium sulphate
(III) Calcium chloride
(IV) Calcium sulphate
(V) Potassium chloride
(VI) Magnesium sulphate
Select from the following group of these salts, each member of which may be dissolved in water to make it hard.
(A) I, II, V
(B) I, III, V
(C) III, IV, VI
(D) II, IV, VI
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
The sodium salt of a long chain fatty acid is called ______.
______ is better than soap for washing clothes when the water is hard.
What is a detergent?
Why have detergents replaced soap as a washing agent?
Which of the two is better for washing clothes when the water is hard: soap or detergent? Give reason for your answer.
What is the advantage of detergents over soaps for washing clothes?
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
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
What are detergents chemically? List two merits and two demerits of using detergents for cleansing. State the reason for the suitability of detergents for washing, event in the case of water having calcium and magnesium ions.
What is meant by ‘surface activity’?
Name three chemicals responsible for the surface activity of various detergents.
Explain why synthetic detergents are superior to soap.
TFM in soaps represents ______ content in soap.
