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.

Subtopic:  Colloidal Solution |
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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

Subtopic:  Colloidal Solution |
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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

Subtopic:  Emulsions |
 75%
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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.

Subtopic:  Colloidal Solution |
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Adsorption is accompanied by:

1. decrease in entropy of the system

2. decrease in enthalpy of the system

3. TS for the process is negative

4. all of the above

Subtopic:  Adsorption and Absorption |
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How is the flocculation value expressed?

1. Millimole per litre.

2. Mole per litre.

3. Gram per litre.

4. Mole per millilitre.

Subtopic:  Colloidal Solution |
 83%
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A liquid which makes scatters a beam of light (visible in a dark room) but leaves no residue when passed through a filter paper is best described as:

1. A suspension

2. Sol

3. True solution

4. None of the above

Subtopic:  Colloidal Solution |
 56%
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Which is an emulsifier?

1. Soap

2. Oil

3. NaCl

4. Water

Subtopic:  Emulsions |
 69%
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KClO3 on heating decomposes into KCl and O2. If some MnO2 is added, the reaction goes much faster because:

1. MnO2 decomposes to give oxygen.

2. MnO2 provides  heat by reacting.

3. Better contact is provided by MnO2

4. MnO2 acts as a catalyst.

Subtopic:  Catalyst |
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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

Subtopic:  Colloidal Solution |
 82%
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