IIT JEE/IIT JEE Surfaces And Catalysis Sample Test,Sample questions

Question:
A colloidal solution may be coagulated by




1.Adding electrolyte

2.Adding oppositely charged sol

3.Heating

4.All of the above.


Question:
A colloidal solution of a solid as dispersed phase and liquid as dispersion medium is known as




1.Gel

2.Sol

3.Solid goam

4.Emulsion.


Question:
A graph of extent of adsorption versus pressure at constant temperature is called




1.Adsorption isobar

2.Adsorption isotherm

3.Adsorption isostere

4.None of these.


Question:
Brownian movement is a ???. property of colloidal solution.




1.Optical

2.Mechanical

3.Colligative

4.Electrical.


Question:
Butter is a colloid containing




1.Fat disperesed in water

2.Fat disperesed in oil

3.Water dispersed in fat

4.None of these.


Question:
Colloidal particles in soap sol carry




1.Negative charge

2.Positive cgarge

3.No charge

4.Either positive or negative charge.


Question:
During electrophoresis of a colloidal solution colloidal particles move towards




1.Anode

2.Cathode

3.Both cathode as well as anode

4.Either cathode or anode.


Question:
For is an example of




1.Foam

2.Aerosol

3.Gel

4.Emulsion.


Question:
For physisorption heat of adsorption is generally in the range




1.20-40 kJ

2.40-60 kJ

3.100-150 kJ

4.300-400 kJ.


Question:
Gelatin is mostly used in masking ice-cream in order to




1.prevent forming the colloidal sol

2.enrich the fragrance

3.prevent crystallisation and stabilize the mix

4.modify the taste.


Question:
Gold number is minimum for




1.Starch

2.Gelatin

3.Gum arabic

4.Albumin.


Question:
Hydrophilic sols are stable due to




1.Small size of the particle

2.Large size of the particle

3.Cgarge on the particle

4.Attractive interaction between colloidal particles and the dispersion mecium.


Question:
In which of the following respcets the lyophilic sols do not differ from lyophobic sols ?




1.Stability

2.Reversibility

3.Particle size

4.Behaviour towards dispersion medium.


Question:
Lyophilic sols have .......... between disperese phase and dispersion.




1.strong attractive interaction

2.little attractive interaction

3.repulsive interaction

4.None of these.


Question:
Portection power of a lyophilic sol is expressed in terms of




1.Coagulation value

2.Gold number

3.Both of the above

4.None of these.


Question:
Size of colloidal particles ranges between




1.1 nm to 100 nm

2.1 nm to 1000 nm

3.10 nm to 1000 nm

4.100 nm to 1000 nm.


Question:
The average molecular mass of colloidal particles can be determined by study of




1.Elevation in boiling point

2.Osmotic pressure

3.Tyndall effect

4.Lowering of vapour pressure.


Question:
Tyndall effect in colloidal solution is due to




1.Scattering of light

2.Reflection of light

3.Absorption of light

4.Presence of electrically charged particles.


Question:
When a river enters the sea a delta is formed. Formation of delta is due to




1.Peptization

2.Coagulation

3.Emulsification

4.Dialysis.


Question:
Which of the following is a homogeneous system ?




1.Muddy water

2.Vanishing cream

3.Cod liver oil

4.Sugar solution.


Question:
Which of the following is an example of associated colloid?




1.Polyethylene sol

2.Rubber sol

3.PVC sol

4.Soap sol.


Question:
Which of the following is not true for physisorption?




1.It is reversible

2.It occurs in the form of multimolecular layers

3.It needs activation energy

4.It increases with increase in pressure.


Question:
Which of the following is not used for purification of colloidal solutions ?



1.Dialysis

2.Ultra-centrifugation

3.Filteration

4.Electrodialysis.


Question:
Which of the following is true for a Gel?




1.Solid as disperse phase

2.Liquid as dispersion medium

3.Both of the above

4.None of these.


Question:
Which of the following metallic sols cannot be prepared by Bredigs arc method?




1.Gold

2.Silver

3.Platinum

4.Sodium.


Question:
Which of the following statement is true for chemisorption?




1.It is reversible in nature

2.It is not specific in nature

3.It exists in the form of monomolecular layer

4.It occurs at low temperature.


Question:
Which of the following statements is not true for lyophilic sols?




1.It is stable

2.It can be prepared in high concentration

3.Its colloidal particles are highly solvated

4.Its colloidal particles are highly solvated


Question:
Which of the following statements is not true for physisorption?




1.Extent of adsorption increases with increases in temperature

2.Heat of adsorption is generally between 20-40 kJ/mole

3.It is not specific

4.It undergoes desorption easily.


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