Coagualation of Lyophilic Sols

Q. Find the positively charged sol from the following

1. Ag
2. $\mathrm{Al}(\mathrm{OH}{)}_3$
   
3. Methylene blue
4. Congo red

Q.

The lower is the value of ionization potential of an element, the greater is its reducing power.

1. True
2. False

Q. Find the positively charged sol from the following

1. Ag
2. $\mathrm{Al}(\mathrm{OH}{)}_3$
   
3. Methylene blue
4. Congo red

Q.

Lyophilic sols are

[IIT-JEE, 2005]

1. Irreversible sols

2. Prepared from inorganic compounds

3. Coagulated by adding electrolytes

4. Self-stabilizing

Q.

Choose the correct reason(s) for the stability of the lyophobic colloidal particles.

[IIT-JEE-2012]

1. Preferential adsorption of ions on their surface from the solution.

2. Preferential adsorption of solvent on their surface from the solution.

3. Attraction between different particles having opposite charges on their surface.

4. Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles.

Q.

The lyophillic sols are

1. reversible in nature

2. irreversible in nature

3. sometimes reversible sometimes not

4. none of the above

Q.

Choose the correct reason(s) for the stability of the lyophobic colloidal particles.

[IIT-JEE-2012]

1. Preferential adsorption of ions on their surface from the solution.

2. Preferential adsorption of solvent on their surface from the solution.

3. Attraction between different particles having opposite charges on their surface.

4. Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles.

Q. Which of the following properties does the coagulating power of an ion depend on?

1. Both the magnitude and the sign of the charge on the ion
   
2. Size of the ion alone
3. The magnitude of the charge on the ion alone
   
4. The sign of charge on the ion alone