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

Subtopic:  Colloidal Solution |
 92%
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An example of intrinsic colloid is:

1. As2S3 sol                         

2. Fe(OH)3 sol

3. egg albumin                     

4. Au sol

Subtopic:  Colloidal Solution |
 69%
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Tails of comets are visible due to:

1. Tyndall effect

2. Reflection

3. Brownian motion

4. None of the above

Subtopic:  Colloidal Solution |
 74%
From NCERT
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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

Subtopic:  Colloidal Solution |
 83%
From NCERT
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Brownian movement is caused by:

1. Colloidal solution.

2. True solution.

3. Suspension having size <1000 mμ.

4. All of the above.

Subtopic:  Colloidal Solution |
 61%
From NCERT
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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

Subtopic:  Colloidal Solution |
 86%
From NCERT
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Which is not a colloid?

1. Chlorophyll                                   

2. Egg white

3. Ruby glass                                   

4. Milk

Subtopic:  Colloidal Solution |
 71%
From NCERT
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Chemisorption is:

1. multimolecular in nature

2. reversible

3. often highly specific and directional

4. not very specific

Subtopic:  Adsorption and Absorption |
 85%
From NCERT
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The catalyst used in the lead-chamber process of sulphuric acid is:

1. platinum

2. nitric oxide

3. nickel

4. vanadium pentoxide

Subtopic:  Catalyst |
From NCERT
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Medicines are more effective if they are used in:

1. Colloidal state

2. Solid-state

3. Solution state

4. None of the above 

Subtopic:  Colloidal Solution |
 89%
From NCERT
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