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

1. AlCl₃

2. Et₃Al

3. H₂C=CH₂

4. Ti⁺³

The gas that is adsorbed strongly by charcoal is: 

1. CO₂                               

2. N₂

3. H₂                                 

4. NH₃

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

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^-

Milk contains a protein that is very good for health. The protein is:

1. caffeine

2. calciferol

3. keratin

4. casein

Emulsions of polyvinylacetate are used in:

1. polishes

2. latex paints

3. fire works

4. rayons

What is the simultaneous outcome of internal liquid from gels called?

1. Synerisis                         

2. Thixotropy

3. Swelling                           

4. None of the above

The charge on As₂S₃ sol is caused by the adsorption of:

1. H⁺                             

2. OH^-

3. ${\mathrm{O}}_2^{-}$                             

4. S^2-

Pd can adsorb 900 times its volume of hydrogen. This called:

1. Absorption

2. Adsorption

3. Occlusion

4. Both 2, and 3

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