Advertisements
Advertisements
प्रश्न
What is the advantage of detergents over soaps for washing clothes? Also state one disadvantage.
उत्तर
Advantages of detergents over soaps:
(1) Detergents can be used with hard water, while soaps cannot be used with hard water.
(2) The cleansing action of detergents is stronger than soaps.
(3) Detergents have a greater solubility in water as compared to soaps.
Disadvantage of detergents:
(1) Some detergents are not bio-degradable; therefore, they pollute water bodies like lakes and rivers. Soaps, on the other hand, are bio-degradable and don't cause water pollution.
APPEARS IN
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
Would you be able to check if water is hard by using a detergent?
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:
............. is better than soap for washing clothes when the water is hard.
State one advantage of soaps over detergent.
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 the differences between Soap and synthetic detergent?
Explain why often coloured spots are formed on clothes during washing.
What are the three main constituents of soap?
______ molecules go and join with dirt and oil in the cloth.
