Chapter 2: Is Matter around us Pure?

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Is Matter around us pure?

Question:

Q.9: Which of the following will show the “Tyndall effect”?

(a)     Salt solution

(b)     Milk

(c)     Copper sulphate solution

(d)     Starch solution

Answer:

(a) Salt dissolves in water to form a true solution. This is because the composition of the particles is uniform to the solution and we cannot distinguish one from another. Thus, the salt solution will not show the Tyndall effect.

(b) Milk is an emulsion that is formed when the fat particles are dispersed in water. So, it is a type of colloidal solution and it will show the Tyndall effect.

(c) The crystal of copper sulphate dissolves in water to form a true solution that has a uniform composition. Thus, the copper sulphate solution will not show the Tyndall effect.

(d) Starch in water forms a sol that contains water as the dispersing medium. So, it’s a type of colloidal solution that will show the Tyndall effect.


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