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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Peptization is the process of?

1. Precipitating colloidal particles.

2. Purifying colloidal particles.

3. Dispersing the precipitate into a colloidal state.

4. None of the above.

Subtopic:  Colloidal Solution |
 59%
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Which acts as poison for Pd-charcoal in lindlar's catalyst ?

1. BaSO4

2. Quiniline

3. Both 1. and 2.

4. None of these

Subtopic:  Catalyst |
 68%
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Which is the electrolyte that is least effective in causing coagulation of +ve ferric hydroxide sol?

1. KBr

2. K2SO4

3. K2CrO4

4. K3[Fe(CN)6]

Subtopic:  Colloidal Solution |
 66%
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Platinized asbestos used as a catalyst in the manufacture of H2SO4 is an example of:

1. heterogeneous catalyst                   

2. auto-catalyst

3. homo-catalyst                                 

4. induced catalyst

Subtopic:  Catalyst |
 78%
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In a reversible reaction, a catalyst:

1. increases the rate of the forward reaction only

2. increases the rate of the forward reaction to a greater extent than that of  the backward reaction

3. increases the rate of the forward reaction and decreases that of the backward reaction to the different extent

4. increases the rate of the forward and backward reactions equally

Subtopic:  Catalyst |
 73%
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