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

Foam is a colloidal solution of:

1. Gaseous particles dispersed in gas               

2. Gaseous particles dispersed in a liquid           

3. Solid particles dispersed in a liquid

4. Solid particles dispersed in gas

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

Alum helps in purifying water by:

1. Forming Si complex with clay particles.

2. Sulphate part which combines with the dirt and removes it.

3. Aluminium which coagulates the mud particles.

4. Making mud water soluble.

Which of the following does not form anionic micelle?

1. C₁₂H₂₅COONa                   

2. C₁₂H₂₅SO₄Na

3. C₁₂H₂₅SO₃Na                     

4. C₁₂H₂₅(NH₃)₃Cl

Milk can be preserved by adding a few drops of?

1. Formic acid solution             

2. Formaldehyde solution

3. Acetic acid solution             

4. Acetaldehyde solution

When a catalyst is added to a system the:

1. equilibrium concentrations are increased

2. equilibrium concentrations are unchanged

3. the rate of forward reaction is increased and that of backward reaction is decreases

4. value of the equilibrium constant is decreased

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.