Chemisorption is:

1. multimolecular in nature

2. reversible

3. often highly specific and directional

4. not very specific

Medicines are more effective if they are used in:

1. Colloidal state

2. Solid-state

3. Solution state

4. None of the above 

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

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

How is the flocculation value expressed?

1. Millimole per litre.

2. Mole per litre.

3. Gram per litre.

4. Mole per millilitre.

Which is an emulsifier?

1. Soap

2. Oil

3. NaCl

4. Water

The capacity of an ion to coagulate a colloidal solution depends on:

1. its shape

2. amount of its charge

3. the sign of charge

4. both amount and sign of the charge