A two phase system consisting of a liquid dispersed in another liquid is known as-

1. Foam 

2. Suspension

3. Emulsion

4. Mist

The cotterells precipitator is used to :

1. neutralize charge on carbon particles in air in smoke

2. coagulate carbon atoms of smoke

3. bring in cataphoresis in carbon particles

4. all of the above

A liquid aerosol is a colloidal system of:

1. a liquid dispersed in a solid

2. a liquid dispersed in a gas

3. a gas dispersed in a liquid

4. a solid dispersed in a gas

A negative catalyst or inhibitor is one:

1. which retards the rate of reaction

2. takes the reaction in forward direction

3. promotes the side reaction

4. None of the above

Which of the following does not form anionic micelle?

1. C₁₂H₂₅COONa                   

2. C₁₂H₂₅SO₄Na

3. C₁₂H₂₅SO₃Na                     

4. C₁₂H₂₅(NH₃)₃Cl

Clouds, mist, fog and aerosols are colloidal solution of:

1. solid in a gas

2. gas in a solid

3. liquid in a gas

4. gas in a liquid

The index for the Gold number is:

1. Protective power of lyophilic colloid.

2. Purity of gold.

3. Metallic gold.

4. Electroplated gold.

Which is an emulsion?

1. Boot polish                             

2. Lipstick

3. Shampoo                               

4. All of these

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

1. caffeine

2. calciferol

3. keratin

4. casein

The charge on As₂S₃ sol is caused by the adsorption of:

1. H⁺                             

2. OH^-

3. ${\mathrm{O}}_2^{-}$                             

4. S^2-