Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
Detergents are generally ammonium or sulphonate salts of long chain carboxylic acids.
Merits of detergents:
(i) Detergent works properly even if the water is hard
(ii) Detergent has better cleansing action than soap.
Demerits of detergents:
(i) Detergents are non-biodegradable.
(ii) Detergents cause environmental and health problems.
Detergents are suitable for cleansing even in hard water because the charged ends of these compounds do not form insoluble precipitates with the calcium and magnesium ions in hard water.
APPEARS IN
संबंधित प्रश्न
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
Explain the formation of scum when hard water is treated with soap.
What change will you observe if you test soap with litmus paper (red and blue)?
Why are soaps not suitable for washing clothes when the water is hard?
What is the difference between soaps and detergents? State, in brief, the cleansing action of soaps in removing an oily spot from a fabric. Why are soaps not very effective when a fabric is washed in hard water? How is this problem resolved?
How will you check with the help of soap powder whether water is hard?
What are the differences between Soap and synthetic detergent?
Explain why soap cannot be used in hard water.
Explain why often coloured spots are formed on clothes during washing.
Soaps are ester of which type of acids?
