Introduction to Colloids

Q.

Size of colloidal particles is

[CPMT 1984; MP PMT 1990, 92]

1. 
2. 
3. 
4. 
   

Q. The volume of colloidal particle $V_c$ as comapred to the volume of solute particle in a true solution $V_s$ could be

1. V_c / V_s = 10²³
2. V_c / V_s = 10^-3
3. V_c / V_s = 10³
4. V_c / V_s = 1

Q. Which of the following is the accurate range for particle size corresponding to colloidal dimensions?

1. 1mm – 1000 mm
2. 1cm – 1000 cm
3. 1nm – 1000 nm
4. 0.001nm – 0.001 nm

Q. We study colloids as part of surface phenomena because

1. Colloids are a heterogeneous system in which phase boundaries exist
2. Colloids are homogenous
3. Colloids have a large surface area and this gives rise to residual forces which are characteristic of such boundaries
4. All of the above

Q. Lyophilic colloids are more stable than lyophobic colloids.

1. True
2. False

Q. Match List I with List II and select the correct answer:-
$\begin{array}{cc}\text{List I}& \text{List II}\\ \text{(A) Coagulation}& \text{(P) Scattering of light}\\ \text{(B) Dialysis}& \text{(Q) Formation of colloidal solution from precipitates}\\ \text{(C) Peptization}& \text{(R) Purification of colloids}\\ \text{(D) Tyndall effect}& \text{(S) Aggregation of colloidal sol}\end{array}$

1. A - P; B - Q; C - R; D - S
2. A - S; B - Q; C - R; D - P
3. A - S; B - R; C - Q; D - P
4. A - R; B - Q; C - S; D - P

Q.

Comment on the statement that "Colloid is not a substance but a state of substance".

Q. The $pH$ of blood is maintained by $C{O}_2$ and $H_{2}C{O}_3$ in the body and chemical constituents of blood. This phenomenon is called:

1. colloidal
2. acidity
3. buffer action
4. salt balance

Q. In the colloidal state the particle size ranges:

1. below 1 nm
2. between 1 nm to 1000 nm
3. less than 100 nm
4. None of the above

Q. Define collodial solution.