Milk can be preserved by adding a few drops of?

1. Formic acid solution             

2. Formaldehyde solution

3. Acetic acid solution             

4. Acetaldehyde solution

Subtopic:  Emulsions |
 57%
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When a catalyst is added to a system the:

1. equilibrium concentrations are increased

2. equilibrium concentrations are unchanged

3. the rate of forward reaction is increased and that of backward reaction is decreases

4. value of the equilibrium constant is decreased

Subtopic:  Catalyst |
 60%
From NCERT
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Clouds, mist, fog and aerosols are colloidal solution of:

1. solid in a gas

2. gas in a solid

3. liquid in a gas

4. gas in a liquid

Subtopic:  Colloidal Solution |
 77%
From NCERT
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The index for the Gold number is:

1. Protective power of lyophilic colloid.

2. Purity of gold.

3. Metallic gold.

4. Electroplated gold.

Subtopic:  Colloidal Solution | Lyophilic & Lyophobic Sol |
 88%
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Silver iodide is used for producing artificial rain because AgI is:
1. Easy to spray at high altitudes.
2. Easy to synthesize.
3. Having crystal structure similar to ice.
4. Insoluble in water.

Subtopic:  Colloidal Solution |
 54%
From NCERT
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Which is an emulsion?

1. Boot polish                             

2. Lipstick

3. Shampoo                               

4. All of these

Subtopic:  Emulsions |
From NCERT
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Egg albumin is:

1. reversible colloid

2. lyophilic colloid

3. protective colloid

4. all of these

Subtopic:  Colloidal Solution |
 66%
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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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