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%
From NCERT
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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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The charge on As2S3 sol is due to to the adsorbed:-

(1) H+

(2) OH-

(3) O-2

(4) S-2

Subtopic:  Colloidal Solution |
 96%
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The most suitable electrolyte for the coagulation of arsenic sulphide will be:-

(1) AlCl3

(2) BaCl2

(3) NaCl

(4) KCl

Subtopic:  Colloidal Solution |
 91%
From NCERT
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