The active species in Zeigler-Natta polymerisation of ethylene is:

1. AlCl3

2. Et3Al

3. H2C=CH2

4. Ti+3

Subtopic:  Catalyst |
From NCERT
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The gas that is adsorbed strongly by charcoal is: 

1. CO2                               

2. N2

3. H2                                 

4. NH3

Subtopic:  Adsorption and Absorption |
 52%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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