Explain the mechanism of the cleaning action of soaps.
The dirt present on clothes is oily in nature and insoluble in water. Therefore, it cannot be removed by only washing with water. When soap is dissolved in water, its hydrophobic ends attach themselves to the dirt and remove it from the cloth. Then, the molecules of soap arrange themselves in micelle formation and trap the dirt at the centre of the cluster. These micelles remain suspended in the water. When flushed with excess water, the dust particles are easily rinsed away by water.
Popular Questions of Class 10 Science
- Q:-
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
- Q:-
Outline a project which aims to find the dominant coat colour in dogs.
- Q:-
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.*Are structural isomers possible for bromopentane?
- Q:-
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
- Q:-
How is the sex of the child determined in human beings?
- Q:-
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common? - Q:-
Calculate the number of electrons constituting one coulomb of charge.
- Q:-
What is an homologous series? Explain with an example.
- Q:-
Why is variation beneficial to the species but not necessarily for the individual?
- Q:-
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
Recently Viewed Questions of Class 10 Science
- Q:-
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
- Q:-
What are the methods used by plants to get rid of excretory products?
- Q:-
Find the power of a concave lens of focal length 2 m.
- Q:-
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
- Q:-
What are the different ways in which glucose is oxidised to provide energy in various organisms?
- Q:-
How do Mendel’s experiments show that traits are inherited independently?
- Q:-
How does the embryo get nourishment inside the mother’s body?
- Q:-
You are given a hammer, a battery, a bulb, wires and a switch.
(a) How could you use them to distinguish between samples of metals and non-metals?
(b) Assess the usefulness of these tests in distinguishing between metals and non-metals. - Q:-
The magnification produced by a plane mirror is +1. What does this mean?
- Q:-
Which sources produce alternating current?
- NCERT Chapter