Question

1. *What is meant by Tyndall effect? What is its cause? Illustrate with example.

2. How would you separate the mixture containing sulphur and sand ?

3. What is crystallization? Give its two applications.

4. How are sol, solution and suspension different from each other?

5. How do we obtain coloured components, i.e. dye from Blue/Black ink?​

Answer 1

Answer:

1. The Tyndall effect is the scattering of light by the particles in a colloid or suspension. The particles scatter a particular wavelength of light and so only the other particles would be visible. ... Example, The dust particles in air or flour in water.

2. Add carbon disulphide to the mixture of sulphur and sand. Sulphur will dissolve in carbon disulphide.

Filter this solution.

The filtrate will contain sulphur dissolved in carbon disulphide and residue will be sand.

Evaporate the filtrate, to obtain Sulphur.

3.Crystallization is also a chemical solid–liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs. ✔The process of crystallization is used to purify a solid from its impurities

4.Solution Sol Suspension A solution is a homogeneous mixture of two or more substances. A sol is a heterogeneous mixture. Suspension is a heterogeneous mixture. ... The particles of a suspension scatter a beam of light passing through it and make its path visible.

5.Evaporation is a useful method to obtain coloured component (dye) from blue/black ink. Ink is a colloidal solution - a heterogeneous mixture of dye and water. When this mixture is heated, water evaporates and dye is left out

Explanation: