Flocculation value is expressed in terms of:

  • Millimole per litre.

  • Mole per litre.

  • Gram per litre.

  • Mole per millilitre.

Compound that acts as inhibitor for knocking in combustion of petrol is : 

  • (C2H5)4Pb                     

  • Ni(CO)4

  • Both (1) and (2)             

  • None of the above.

Which does not show the Tyndall effect?

  • Emulsion

  • Blood

  • Milk

  • Sugar solution

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

  •  CH3CH215N+CH33Br-

  •  CH3CH211OSO3-Na+

  •  CH3CH26COO-Na+

  •  CH3CH211N+CH33Br-

Butter is a colloid form in which:

  • fat is dispersed in solid casein

  • fat globules are dispersed in water

  • water is dispersed in fat

  • suspension of casein is in water

The cotterells precipitator is used to :

  • neutralize charge on carbon particles in air in smoke

  • coagulate carbon atoms of smoke

  • bring in cataphoresis in carbon particles

  • all of the above

Foam is a colloidal solution of:

  • Gaseous particles dispersed in gas               

  • Gaseous particles dispersed in a liquid           

  • Solid particles dispersed in a liquid

  • Solid particles dispersed in gas

A liquid aerosol is a colloidal system of:

  • a liquid dispersed in a solid

  • a liquid dispersed in a gas

  • a gas dispersed in a liquid

  • a solid dispersed in a gas

A negative catalyst or inhibitor is one:

  • which retards the rate of reaction

  • takes the reaction in forward direction

  • promotes the side reaction

  • None of the above

Alum helps in purifying water by:

  • Forming Si complex with clay particles.

  • Sulphate part which combines with the dirt and removes it.

  • Aluminium which coagulates the mud particles.

  • Making mud water soluble.

Which of the following does not form anionic micelle?

  • C12H25COONa                   

  • C12H25SO4Na

  • C12H25SO3Na                     

  • C12H25(NH3)3Cl

Milk can be preserved by adding a few drops of:

  • Formaldehyde solution

  • Formic acid solution             

  • Acetic acid solution             

  • Acetaldehyde solution

When a catalyst is added to a system the:

  • equilibrium concentrations are increased

  • equilibrium concentrations are unchanged

  • the rate of forward reaction is increased and that of backward reaction is decreases

  • value of the equilibrium constant is decreased

Clouds, mist, fog and aerosols are colloidal solution of:

  • solid in a gas

  • gas in a solid

  • liquid in a gas

  • gas in a liquid

Gold number is the index for:

  • Protective power of lyophilic colloid.

  • Purity of gold.

  • Metallic gold.

  • Electroplated gold.

Silver iodide is used for producing artificial rain because AgI is:

  • Easy to spray at high altitudes.

  • Easy to synthesize.

  • Having crystal structure similar to ice.

  • Insoluble in water.

Which is an emulsion?

  • Boot polish                             

  • Lipstick

  • Shampoo                               

  • All of these

Egg albumin is:

  • reversible colloid

  • lyophilic colloid

  • protective colloid

  • all of these

In Zeigler-Natta polymerisation of ethylene, the active species is:

  • AlCl3

  • Et3Al

  • H2C=CH2

  • Ti+3

The gas that is adsorbed strongly by charcoal is: 

  • CO2                               

  • N2

  • H2                                 

  • NH3

The decomposition of H2O2 may be checked by adding a small quantity of phosphoric acid. This is an example of:

  • Neutralization                             

  • Negative catalysis

  • Positive catalysis                         

  • Catalytic poisoning

When dilute aqueous solution of AgNO3 (excess) is added to KI solution, positively charged sol particles of AgI are formed due to adsorption of ion:

  • K+

  • Ag+

  • I-

  • NO3-

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

  • caffeine

  • calciferol

  • keratin

  • casein

Emulsions of polyvinylacetate are used in:

  • polishes

  • latex paints

  • fire works

  • rayons

The simultaneous outcome of internal liquid from gels is called:

  • Synerisis                         

  • Thixotropy

  • Swelling                           

  • None of the above

The charge on As2S3 sol is due to the adsorption of:

  • H+                             

  • OH-

  •  O2-                             

  • S2-

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

  • Absorption

  • Adsorption

  • Occlusion

  • Both 2, and 3

The Brownian motion is due to:

  • temperature fluctuations within the liquid phase

  • attraction and repulsion between charges on the colloidal particles

  • impact of the molecules of the dispersion medium on the colloidal particles

  • convective currents

The phenomenon in which adsorption and absorption takes place simultaneously is called:

  • Desorption                       

  • Sorption

  • Both 1 and 2              

  • None of these

Cloud bursts due to:

  • Attraction towards the electrical charges on the earth.

  • Large amount of water present in the cloud.

  • Dense clouds are present in the upper atmosphere.

  • Mutual discharge of oppositely charged clouds resulting in the coagulation.

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