Introduction to Colloids

Q.

What is gold no. ? Explain with example

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.

How to calculate the gold number?

Q.

What is the application of colloids?

Q.

Whipped cream is a:

1. Gel

2. Sol

3. Emulsion

4. Foam

Q.

The surface tension of Lyophilic sols is:

1. Lower than that of ${\mathrm{H}}_2\mathrm{O}$

2. More than that of ${\mathrm{H}}_2\mathrm{O}$

3. Equal to that of ${\mathrm{H}}_2\mathrm{O}$

4. Either less or more concerning${\mathrm{H}}_2\mathrm{O}$ depending on the nature of the disperse phase.

Q.

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

Q. What is the effect on viscosity and surface tension of a lyophilic and lyophobic colloidal solution?

Q.

what is size of colloidal particles?

Q.

Any two immiscible liquids when mixed form an:

1. Gel

2. Emulsion

3. Sol

4. Aerosol

Q. What is vant Hoff factor of baryta water

Q.

Define aerosol and give one example.

Q.

Why is gelatine is added to ice-creams?

Q. Evaporation is useful method to obtain coloured component (dye) from blue/black ink. Ink is a ________.

1. colloidal solution
2. suspension
3. true solution
4. precipitate

Q. What type of colloid is formed when a gas is dispersed in a liquid? Give an example.

Q. What are fatty acds? What is their structure ?

Q.

The human blood is buffered by ____

1. NH₄OH + NH₄Cl

2. NaOH + NaCl

3. HCO₃^- + CO₃^-2

4. H₃PO₄ + NaH₂PO₄

Q. What is gold number?

Q.

Water-in-oil emulsions is also called as:

1. Alcoholic emulsion

2. Aqueous emulsion

3. Electrophoresis

4. Oily emulsion

Q. Lyophilic colloids are more stable than lyophobic colloids.

1. True
2. False

Q. The size of the colloidal particles lies in the range :

1. $10nm-1000nm$
2. $10\mu m-1000\mu m$
3. ${10}^{-5}cm-{10}^{-7}cm$
4. $1nm-1000nm$

Q. Difference between crystalloid and colloid is of :

1. particle size
2. none of the above
3. solute size
4. diffusion through a membrane

Q. Why sucrose is called invert sugar

Q. What kind of a colloidal solution is an emulsion?

1. Solid dispersed in solid
2. Liquid dispersed in liquid
3. Gas dispersed in liquid
4. Liquid dispersed in solid

Q.

What is the cause of the Brownian motion?

Q. What is the meaning of statement-Isomorphous substances can grow in saturated solutions of each other

Q.

When and who found the existence and motion of particles in liquids?

Q. Explain self and cross aldol condensation

Q. Give two examples of Colloid.

Q. What is a homogeneous solution with intermediate particle size between a solution and a suspension?

1. Element
2. Solute
3. Pure compound
4. Colloid