Question

Colloidal solution appears to be homogeneous, but actually it is heterogeneous. Give reason for the justification of the statement. (4 marks) Please help.... It is very urgent.... My exam is there tomorrow..... Please....

Answer 1

At the microscopic level, a colloid is heterogenous. At the macroscopic level it is homogenous.

Macroscopically, a colloid shows a single "phase": if you sample a few micro liters anywhere, it will always have the same composition. But if you look at the microscopic level, you will find that there are at least two different regions, each with a different composition.

What you should follow is dependent on whether the macroscopic or microscopic properties matter more to what you are studying.

Answer 2

⏺heya friend !

✔here's your answer :-

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collidal solution appears to be homogeneous but actually it is heterogeneous.

➡reason -

⚫in collidal solution the size of particles is too less ie approximately 1 nanometer(1/9th part of a meter)... or even less than that.
⚫so, bcause of the small size of colloidal particles, we cannot see them with naked eyes.
⚫although the particles are heterogeneous ie not mixed properly and composition and properties varying throughout mixture , yet they appear to be homogeneous ie perfectly mixed throughout.
⚫But, these particles can easily scatter a beam of visible light .
⚫This scattering of light is called Tyndall Effect as can be seen in (b)  colloidal solution and (a) in homogeneous solution.

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i hope it helps u !!!☺