An emulsifier is a substance which:

(1) Homogenesis the emulsion

(2) Stabliizes the emulsion

(3) Retards the dispersion of liquid in liquid

(4) Coagulates the emulsion

Subtopic:  Emulsions |
 78%
From NCERT
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Flocculation value is expressed in terms of:

(a) millimole per litre

(b) mole per litre

(c) gram per litre

(d) mole per millilitre

Subtopic:  Colloidal Solution |
 84%
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Which is an emulsifier?

(1) Soap

(2) Oil

(3) NaCl

(4) Water

Subtopic:  Emulsions |
 72%
From NCERT
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The capacity of an ion to coagulate a colloidal solution depends on:

(1) It's shape

(2) Amount of its charge

(3) The sign of charge

(4) Both amount and sign of the charge

Subtopic:  Colloidal Solution |
 85%
From NCERT
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Lyophobic collloids are:

(1)reversible colloids

(2)irreversible colloids

(3)protective colloids

(4)gum, proteins

Subtopic:  Lyophilic & Lyophobic Sol |
 77%
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The decomposition of H2O2 may be checked by adding a small quantity of phosphoric acid. This is an example of:

(a) neutralization           (b) negative catalysis

(c) positive catalysis       (d) catalytic poisoning

Subtopic:  Colloidal Solution |
 54%
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Which of the following is not applicable to chemisorption?

1. Its heat of adsorption is high

2. It takes place at high temperature

3. It is reversible

4. It forms unimolecular layer

Subtopic:  Adsorption and Absorption |
 89%
From NCERT
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As2S3 sol is

1. possible colloid                 2. negative colloid

3. neutral colloid                  4. none of the above

Subtopic:  Colloidal Solution |
 90%
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At the critical micelle concentration (CMC) the surfactant molecule

1. Decompose

2. Dissociate

3. Associate

4. Become completely soluble

Subtopic:  Emulsions |
 80%
From NCERT
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Which one has the highest coagulation power?

(1) K+

(2) Ca++

(3) Al+++

(4) Sn4+

Subtopic:  Colloidal Solution |
 79%
From NCERT
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