Which acts as inhibitor for knocking in combustion of petrol?

1. (C2H5)4Pb                     

2. Ni(CO)4

3. both (a) and (b)             

4. none of these

Subtopic:  Catalyst |
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Which does not show Tyndall effect?

1. Emulsion

2. Blood

3. milk

4. sugar solution

Subtopic:  Colloidal Solution |
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Among the following surfactant molecules, the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is:

1. CH3CH215N+CH33Br-

2. CH3CH211OSO3-Na+

3. CH3CH26COO-Na+

4. CH3CH211N+CH33Br-

Subtopic:  Emulsions |
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Butter is a colloid form in which:

1. fat is dispersed in solid casein

2. fat globules are dispersed in water

3. water is dispersed in fat

4. suspension of casein is in water

Subtopic:  Colloidal Solution |
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The cotterells precipitator is used to :

1. neutralize charge on carbon particles in air in smoke

2. coagulate carbon atoms of smoke

3. bring in cataphoresis in carbon particles

4. all of the above

Subtopic:  Adsorption and Absorption | Colloidal Solution |
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Foam is a colloidal solution of:

1. gaseous particles dispersed in gas               

2. gaseous particles dispersed in a liquid           

3. solid particles dispersed in a liquid

4. solid particles dispersed in gas

Subtopic:  Colloidal Solution |
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A liquid aerosol is a colloidal system of:

1. a liquid dispersed in a solid

2. a liquid dispersed in a gas

3. a gas dispersed in a liquid

4. a solid dispersed in a gas

Subtopic:  Colloidal Solution |
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Negative catalyst or inhibitor is one:

1. which retards the rate of reaction

2. takes the reaction in forward direction

3. promotes the side reaction

4. none of the above

Subtopic:  Catalyst |
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Alum helps in purifying water by:

1. forming Si complex with clay particles

2. sulphate part which combines with the dirt and removes it

3. aluminium which coagulates the mud particles

4. making mud water soluble

Subtopic:  Colloidal Solution |
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Which of the following does not form anionic micelle?

1. C12H25COONa                   

2. C12H25SO4Na

3. C12H25SO3Na                     

4. C12H25(NH3)3Cl

Subtopic:  Emulsions |
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