A small amount of phosphoric acid can be used to prevent H2O2 decomposition. This an example of?

1. Neutralization                             

2. Negative catalysis

3. Positive catalysis                         

4. Catalytic poisoning

Subtopic:  Catalyst |
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Which ion is adsorbed when a diluted aqueous solution of AgNO3 (excess) is added to KI solution, resulting in formation of positively charged sol particles of AgI?

1. K+

2. Ag+

3. I-

4. NO3-

Subtopic:  Adsorption and Absorption |
 65%
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Milk contains a protein that is very good for health. The protein is:

1. caffeine

2. calciferol

3. keratin

4. casein

Subtopic:  Colloidal Solution | Lyophilic & Lyophobic Sol |
 88%
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Emulsions of polyvinylacetate are used in:

1. polishes

2. latex paints

3. fire works

4. rayons

Subtopic:  Emulsions |
 54%
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What is the simultaneous outcome of internal liquid from gels called?

1. Synerisis                         

2. Thixotropy

3. Swelling                           

4. None of the above

Subtopic:  Colloidal Solution |
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The charge on As2S3 sol is caused by the adsorption of:

1. H+                             

2. OH-

3. O2-                             

4. S2-

Subtopic:  Colloidal Solution |
 79%
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Pd can adsorb 900 times its volume of hydrogen. This called:

1. Absorption

2. Adsorption

3. Occlusion

4. Both 2, and 3

Subtopic:  Catalyst |
 54%
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The Brownian motion is due to:

(1)temperature fluctuations within the liquid phase

(2)attraction and repulsion between charges on the colloidal particles

(3)impact of the molecules of the dispersion medium on the colloidal particles

(4)convective currents

Subtopic:  Colloidal Solution |
 61%
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The phenomenon in which adsorption and absorption takes place simultaneously is called:

1. Desorption                       

2. Sorption

3. Both 1 and 2              

4. None of these

Subtopic:  Adsorption and Absorption |
 88%
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Cloud bursts are caused by?

1. Attraction towards the electrical charges on the earth.
2. Large amount of water present in the cloud.
3. Dense clouds are present in the upper atmosphere.
4. Mutual discharge of oppositely charged clouds resulting in the coagulation.
Subtopic:  Colloidal Solution |
 83%
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