A dust storm is:

1. Dispersion of solid in gas

2. Dispersion of a gas in solid

3. Dispersion of solid in solid

4. Dispersion of a gas in liquid

Which is not a colloid?

1. Chlorophyll                                   

2. Egg white

3. Ruby glass                                   

4. Milk

Chemisorption is:

1. multimolecular in nature

2. reversible

3. often highly specific and directional

4. not very specific

The catalyst used in the lead-chamber process of sulphuric acid is:

1. platinum

2. nitric oxide

3. nickel

4. vanadium pentoxide

Medicines are more effective if they are used in:

1. Colloidal state

2. Solid-state

3. Solution state

4. None of the above 

Hydrolysis of maltose (C₁₂H₂₂O₁₁) by maltase gives:

1. glucose                         

2. fructose

3. both 1 and 2         

4. none of these

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.