Colloidal Solution

The protecting power of lyophilic colloidal sol is expressed in terms of:

1. Coagulation value

2. Gold number

3. Critical micelle concentration

4. Oxidation number

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below
I. (NaCl) = 52, II. (BeCl₂) = 0.69, III. (MgSO₄) = 0.22
What is the correct order of their coagulating power?
1. I > II > III
2. II > I >III
3. III > II > I
4. III > I >II

Which mixture of the solutions will lead to the formation of a negatively charged colloidal [AgI]I^- sol?

1. 50 mL of 0.1 M AgNO₃ + 50 mL of 0.1 M KI

2. 50 mL of 1 M AgNO₃ + 50 mL of 0.5 M KI

3. 50 mL of 1 M AgNO₃ + 50 mL of 2 M KI

4. 50 mL of 2 M AgNO₃ + 50 mL of 1.5 M KI

In which of the sols, the colloidal particles are with a negative charge?

1. TiO₂

2. Hemoglobin

3. Starch

4. Hydrated Al₂O₃

The right option for the statement "Tyndall effect is exhibited by", is:

1. Starch solution

2. Urea solution

3. NaCl solution

4. Glucose solution

Given below are two statements:

Statement I:	In the coagulation of a negative sol, the flocculating power of the three given ions is in the order Al3+ > Ba2+ > Na+
Statement II:	In the coagulation of a positive sol, the flocculating power of the three given salts is in the order NaCl > Na2SO4 > Na3PO4

In the light of the above statements, choose the most appropriate answer from the options given below:

1.	I is incorrect but II is correct.
2.	Both I and II are correct.
3.	Both I and II are incorrect.
4.	I is correct but II is incorrect.

Pumice stone is an example of-

1.	foam	2.	sol
3.	gel	4.	solid sol