Q12 of 25 Page 154


In the above case, Sekar observed that the water turned sweeter after sometime.


Explain the reason for the same.

The water turned sweet after sometime due to the process of diffusion. Diffusion is the movement of solute particles/molecules/ions from a region of higher concentration to a region of lower concentration.

In the above diagram, the concentration of sugar molecules is higher in the sugar solution and less in the water. So the sugar molecules get diffused from the region of higher concentration (sugar solution) to region of lower concentration (water). Due to this reason water turned sweeter after sometime.


More from this chapter

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10

Give the dispersed phase and the dispersion medium in each of the following:

a. cheese b. soda water c. Smoke

 11

Radha prepared a solution which could be separated by filtration.

i) Name the type of solution.


ii) Is the solution transparent or opaque?


iii) Mention the nature of the solution.


iv) Mention the size of the solute particle.

 13

Beaker ‘A’ has chalk powder mixed with water and beaker ‘B’ has protein dissolved in water.

i) Which solution shows Brownian movement?


ii) Identify the solution that has particle size greater than 2000Å


iii) Which beaker contains colloidal solution?


iv) Mention the size of the particle present in beaker B.


v) Say whether colloidal solution is homogeneous or heterogeneous

 14

Justify the following statements with an explanation:

i) Solubility of calcium oxide decreases with increase in temperature.


ii) What happens to the solubility in exothermic process with regard to temperature?


iii) In endothermic process, solubility increases with increase in temperature.


iv) At a given temperature, increase in pressure increases the solubility of the gas.