Hydrolysis of cane-sugar is catalysed by:

1. H⁺                         

2. mineral acids

3. enzymes                 

4. all of these

Which is not shown by sols?

1. Adsorption

2. Tyndall effect

3. Flocculation

4. Paramagnetism

Detergent action of synthetic detergents is due to their:

1. interfacial area

2. high molar mass

3. ionization

4. emulsifying properties

What does the name "aquadag" refer to?

1. Cu in water sol.

2. Pt in water sol.

3. Graphite in water sol.

4. None of the above.

What results are obtained from adding FeCl₃ to K₄[Fe(CN)₆] in a diluted, cold solution?

1. Prussian blue sol.                     

2. Fe₄[Fe(CN)₆]₃ sol.

3. Positive sol.                               

4. All of the above.

Which of the following electrolytes, Na₂SO₄, CaCl₂, Al₂(SO₄)₃, and NH₄Cl, is the most effective coagulating agent for Sb₂S₃ sol?

1. Na₂SO₄                             

2. CaCl₂

3. Al₂(SO₄)₃                           

4. NH₄Cl

Among the given options, which element is the minimum required for precipitation of a negatively charged suspension of clay in water?

1. Aluminium chloride.

2. Potassium sulphate.

3. Sodium hydroxide.

4. Hydrochloric acid.

The arsenious sulphide sol has negative charge. The maximum coagulationg power for precipitating it is of :

1. 0.1 N Zn(NO₃)₂

2. 0.1 N Na₃PO₄

3. 0.1 N ZnSO₂

4. 0.1 N AlCl₃

An emulsifier is a substance that:

1. Homogenesis the emulsion

2. Stabilizes the emulsion

3. Retards the dispersion of liquid in the liquid

4. Coagulates the emulsion

What is a colloidal solution that is commonly used to treat skin diseases?

1. Colloidal sulphur.                   

2. Colloidal silver.

3. Colloidal gold.                         

4. Colloidal antimony.