| Direction: Q.11 to 15 |
| Read the following and answer questions from [11] to [15]. |
| The scattering of a beam of light by colloidal particles is called Tyndall effect. |
| Due to scattering of light, the path of the light becomes visible. The source of light may be explored completely. The size of the scattering particles determines the colour of scattered light. The colloidal particles may be seen moving as points of light moving against a black backdrop. |
| Ravi took some amount of substance X and add it into a transparent beaker containing water. He mixed the solution very well and then passed light through this solution by using a torch. The result observed by him is shown below : |
 |
| Ravi wants to show this experiment to his younger brother. He kept the solution for 10 minutes and calls his brother and further repeat the experiment, but results are different at this time. The path is not visible. |
A) In first case, the path is visible because of the presence of impurities
B) In second case, the particles settle down
C) In second case, the concentration increases
D) In second case, the impurities dissolve in the solution
Correct Answer: B
Solution :
[b] In second case, the particles settle down which were suspended throughout the bulk and the path became not visible.
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