Coloured Compounds

Q. A suspension and a colloidal solution, both are heterogeneous mixtures. Identify the correct statement(s) referring to both types of solutions.

1. In a suspension, the particles cannot be seen with the naked eye whereas, in a colloidal solution, they can be.
2. In a suspension, the particles can be seen with naked eye whereas, in a colloidal solution, they cannot be.
3. Both can scatter light and make its path visible.
4. Only suspension can scatter light and colloidal solutions cannot.

Q.

What would you observe when:

a colloidal solution of starch is passed through an ordinary filter paper?

Q.

Differentiate between a true solution and a colloidal solution.

Q.

In which of the following diffusion does not occur?

1. When seen under microscope, the colloidal particles in a colloid are seen to be moving in a random fashion.

2. When seen under microscope, the colloidal particles in a colloid are seen to be moving in a fixed fashion.

3. When seen under microscope, the colloidal particles in a mixture are seen to be moving in a fixed fashion.

4. When seen under microscope, the colloidal particles in a mixture are seen to be moving in a random fashion.

Q.

X is an intermediate between suspension and solution and is also a homogeneous looking like heterogeneous mixture in which particles have size between 1nm to 100nm. Name X.

1. Mixture

2. Compound

3. Colloid

4. Suspension

Q.

X is an intermediate between suspension and solution. It is also a homogeneous looking like heterogeneous mixture in which particles have size between 1nm to 100nm. Name X.

1. Mixture

2. Suspension

3. Colloid

4. Compound

Q. A homogenous non crystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance are known as colloids. These colloids are of different types. What are they?

1. Gel
2. Emulsions
3. Sol
4. All of these

Q. What is emulsifying action? Can boiling the water remove hardness of water?

Q. The formation of colloid from suspension is called

1. Peptisation
2. Sedimentation
3. Fragmentation
4. Condensation

Q.

Give five important points of differences between a true solution and a colloidal solution

Q. On which factor adsorption of gas on solid adsorbtion depend ?

1. On temperature
2. On nature of adsorbent
3. On pressure of gas
4. All of the above

Q. Question 16
Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do?

Q. In aerosol, the dispersion medium is?

1. Solid
2. Liquid
3. Gas
4. Any of these

Q. The 8 : 8 type of packing is present in:

1. $Mg{F}_2$
2. $CsCl$
3. $KCl$
4. $None$

Q. According to the adsorption theory of catalysis, the speed of the reaction increases because :

1. in the process of adsorption, the activation energy of the molecules become large
2. the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
3. adsorption lowers the activation energy of the raction
4. adsorption produces heat which increases the speed of the reaction