Advertisements
Advertisements
प्रश्न
- Write the formula and draw electron dot structure of carbon tetrachloride.
- What is saponification? Write the reaction involved in this process.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Both soap and detergent are some type of salts. What is the difference between them?
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
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
What change will you observe if you test soap with litmus paper (red and blue)?
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
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
Explain esterification reaction with the help of a chemical equation. Describe an activity to show esterification.
The sodium salt of a long chain fatty acid is called ______.
What change will you observe if you test soap solution with a litmus paper (red and blue)? Give reason for your observation.
Which of the two is better for washing clothes when the water is hard: soap or detergent? Give reason for your answer.
Give any two differences between soaps and detergents.
Give the reason of formation of scum when soaps are used with hard water.
Distinguish between esterification and saponification reactions of organic compounds.
Answer the following question.
In three test tubes A, B, and C, three different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap Answer is added to each test tube and the contents are shaken. In which test tube will the length of the foam (lather) be longest? Justify your answer.
How will you check with the help of soap powder whether water is hard?
Explain why soap cannot be used in hard water.
What are the two different types of molecules found in the soap?
Analogy:
Used to join components: Adhesives:: Clean the body ______.
______ molecules go and join with dirt and oil in the cloth.
