Advertisements
Advertisements
प्रश्न
Explain why soap cannot be used in hard water.
Advertisements
उत्तर
Soaps cannot be used in hard water because they lose their cleansing property when used with it. Soaps do not form lather with hard water and instead form scum, as a result of which they lose their cleansing property.
संबंधित प्रश्न
What change will you observe if you test soap with litmus paper (red and blue)?
State one use of saponification process.
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.
Fill in the following blank with suitable word:
The sodium salt of a long chain fatty acid is called .............
Give any two differences between soaps and detergents.
What is the advantage of detergents over soaps for washing clothes? Also state one disadvantage.
In a soap micelle, the soap molecules are arranged radially with:
(a) ionic ends directed towards the centre and hydrocarbon ends directed outwards
(b) hydrocarbon ends directed towards the centre and ionic ends directed outwards
(c) both ionic ends and hydrocarbon ends directed toward the centre
(d) both hydrocarbon ends and ionic ends directed outwards
Soap is a salt of ______ and sodium hydroxide.
What are the three main constituents of soap?
