Purification of Colloidal Solution

Q. Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface ?

1. $\Delta H<0,\Delta S<0$
2. $\Delta H>0,\Delta S>0$
3. $\Delta H>0,\Delta S<0$
4. $\Delta H<0,\Delta S>0$

Q.

Which of the following does not involve coagulation

1. Peptization

2. Formation of delta region

3. Treatment of drinking water by potash alum

4. Clotting of blood by the use of ${\mathrm{FeCl}}_3$

Q. what is lyophillic and lyophobic colliolids?

Q. What is the meaning of blunt/flush/sticky ends?

Q.

Explain the following terms:

(i) Electrophoresis (ii) Coagulation

(iii) Dialysis (iv) Tyndall effect.

Q.

Alums purify muddy water by :

1. dialysis

2. absorption

3. coagulation

4. forming true solution

Q.

What is aggregation of colloidal particles into insoluble precipitate by addition of some suitable electrolyte called?

1. Dialysis

2. Coagulation

3. Emulsion

4. Peptization

Q.

Assertion: An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.
Reason: Pore size of the filter paper becomes more than the size of colloidal particle.

1. Assertion and reason both are correct and the reason is the correct explanation of assertion

2. Assertion and reason both are correct but reason does not explain assertion

3. Both assertion and reason are incorrect.

4. Assertion is incorrect but reason is correct.

5. Assertion is correct but reason is incorrect.

Q.

The process in which colloid is placed inside a bag of semi permeable membrane like cellophane or parchment paper which permits ions and not colloids to pass through, is called as:

1. Emulsion

2. Peptization

3. Coagulation

4. Dialysis

Q. XeO3 is isostructural with SF4 NH3 XeO₂F2 H₂0

Q. The nature of charge on resulting colloidal particles when $FeC{l}_3$ is added to excess of hot water is:

1. positive
2. neutral
3. sometimes positive and sometimes negative
4. negative

Q. 15. Which is more concentrated molarity or molality and why

Q. Write one difference in each of the following:
(a) Multimolecular colloid and Associated colloid
(b) Coagulation and Peptization
(c) Homogeneous catalysis and Heterogeneous catalysis

Q. Alums purify muddy water by :

1. dialysis
2. absorption
3. coagulation
4. forming true solution

Q.

What will happen if a colloidal solution of sulphur is centrifuged in a centrifugal machine for some time?

Q. A kind of filtration method, where the suspended solids/ solutes are separated from the colloidal solution because of their concentration gradient, by passing the solution through a semipermeable membrane is known as :

1. Ultra filtration
2. Ultra centrifugation
3. Dialysis
4. Electrodialysis

Q. Assertion :Colloidal solutions are purified by dialysis. Reason: In the process of dialysis, colloidal particles pass through parchment paper.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. What is meant by coagulation of a colloidal solution? Describe briefly any three methods by which coagulation of lyophobic sols can be carried out.

Q. In column chromatography stationary phase is :

1. Only solid
2. Only liquid
3. Any one of these
4. Only gas

Q. Draw a labelled diagram of dialysis method, for purification of colloidal solutions.

Q. Which is the fastest method for purification of a colloid?

1. Ultrafiltration
2. Ultracentrifugation
3. Dialysis
4. Electro-dialysis

Q. The separation of colloidal particles (or purification of sol) from particles of molecular dimensions is known as :

1. dialysis
2. photolysis
3. pyrolysis
4. peptization

Q. Colloidal sols can be purified by:

1. Dialysis
2. Ultra-filtration
3. Ultra-centrifugation
4. All of these

Q. Assertion :Colloidal silver iodide is prepared by adding silver nitrate in slight excess to potassium iodide solution. When subjected to an electric field, the colloidal particles migrate to the anode. Reason: Colloidal particles adsorb ions and thus become electrically charged.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Which of the following are methods employed to purify colloids?

1. Dilution
2. Ultrafiltration
3. Peptization
4. Dialysis

Q. What is the name of the process for the separation of colloidal particles from those of crystalloids called?

1. Dialysis
2. Pyrolysis
3. Photolysis
4. Peptization

Q. Does colloids (heterogeneous mixture) diffuses.And what is tyndall effect and Brownian moment? What is the size of colloid particle

Q. A coagulating agent frequently added to water to remove the suspended and colloid impurities is:

1. Bleaching powder
2. Copper sulphate
3. Alum
4. Mohr salt

Q. What are the different methods applied for the purification of colloidal solutions?

1. Dialysis
2. Ultra filtration
3. Normal filtration
4. None of these

Q. Describe the method for the purification of colloidal sol containing excess amount of electrolytes with diagram :