Hardy-Schulze rule states that:

1. non-electrolytes have better coagulating action on colloids than electrolytes

2. sols are coagulated by effective ions whose charge is opposite to that of sol and the ions of higher charge are much more effective than the ions of lower charge

3. charge of the ions has no effect on the coagulation of a sol

4. sols are coagulated only by those ions whose charge is similar to that of the sol

An example of intrinsic colloid is:

1. As₂S₃ sol                         

2. Fe(OH)₃ sol

3. egg albumin                     

4. Au sol

Tails of comets are visible due to:

1. Tyndall effect

2. Reflection

3. Brownian motion

4. None of the above

Bleeding is stoped by the application of ferric chloride. This is because :

1. the blood starts flowing in the opposite direction

2. the blood reacts and a solid is formed which seals the blood vessel

3. the blood is coagulated and the blood vessel are sealed

4. the ferric chloride seals the blood vessel

Brownian movement is caused by:

1. Colloidal solution.

2. True solution.

3. Suspension having size <1000 m$\mathrm{\mu }$.

4. All of the above.

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