The index for the Gold number is:

1. Protective power of lyophilic colloid.

2. Purity of gold.

3. Metallic gold.

4. Electroplated gold.

Milk contains a protein that is very good for health. The protein is:

1. caffeine

2. calciferol

3. keratin

4. casein

When sulphur sol is evaporated solid sulphur is left. On mixing with water no colloidal sol is formed. Sulphur sol is: 

1. hydrophilic

2. hydrophobic

3. reversible

4. lyophilic

What is a solution that isn't a lyophilic colloid?

1. Milk

2. Gum

3. Fog

4. Blood

Which is not shown by sols?

1. Adsorption

2. Tyndall effect

3. Flocculation

4. Paramagnetism

Lyophobic colloids are:

1. Reversible colloids

2. Irreversible colloids

3. Protective colloids

4. Gum, and proteins

Surface tension of lyophilic sols is :

1. Lower than water.

2. More than water.

3. Equal to water.

4. None of the above.

An emulsifying agent is a substance which 

1. Stabilizes the emulsion.

2. De-stabilizes the emulsion.

3. Coagulates the emulsion.

4. Break the interfacial film between suspended particle and medium.

The stabilization of the dispersed phase in a lyophobic sol is due to

(1) The viscosity of the medium

(2) The surface tension of the medium

(3) Liking for the medium

(4) The formation of an electrical layer between the two phases

Lyophilic sols are:

(1) Irreversible sols

(2) They are prepared from inorganic compounds

(3) Not coagulated by adding electrolytes

(4) Self-stabilizing