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IIT JEE Surfaces And Catalysis
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IIT JEE Surfaces And Catalysis
1
When a river enters the sea a delta is formed. Formation of delta is due to
A
Peptization
B
Coagulation
C
Emulsification
D
Dialysis.
2
Which of the following is not used for purification of colloidal solutions ?
A
Dialysis
B
Ultra-centrifugation
C
Filteration
D
Electrodialysis.
3
During electrophoresis of a colloidal solution colloidal particles move towards
A
Anode
B
Cathode
C
Both cathode as well as anode
D
Either cathode or anode.
4
Which of the following is not true for physisorption?
A
It is reversible
B
It occurs in the form of multimolecular layers
C
It needs activation energy
D
It increases with increase in pressure.
5
Tyndall effect in colloidal solution is due to
A
Scattering of light
B
Reflection of light
C
Absorption of light
D
Presence of electrically charged particles.
6
For physisorption heat of adsorption is generally in the range
A
20-40 kJ
B
40-60 kJ
C
100-150 kJ
D
300-400 kJ.
7
For is an example of
A
Foam
B
Aerosol
C
Gel
D
Emulsion.
8
Which of the following is an example of associated colloid?
A
Polyethylene sol
B
Rubber sol
C
PVC sol
D
Soap sol.
9
Brownian movement is a ???. property of colloidal solution.
A
Optical
B
Mechanical
C
Colligative
D
Electrical.
10
Portection power of a lyophilic sol is expressed in terms of
A
Coagulation value
B
Gold number
C
Both of the above
D
None of these.
11
Which of the following statement is true for chemisorption?
A
It is reversible in nature
B
It is not specific in nature
C
It exists in the form of monomolecular layer
D
It occurs at low temperature.
12
A colloidal solution of a solid as dispersed phase and liquid as dispersion medium is known as
A
Gel
B
Sol
C
Solid goam
D
Emulsion.
13
Which of the following statements is not true for lyophilic sols?
A
It is stable
B
It can be prepared in high concentration
C
Its colloidal particles are highly solvated
D
Its colloidal particles are highly solvated
14
Which of the following is a homogeneous system ?
A
Muddy water
B
Vanishing cream
C
Cod liver oil
D
Sugar solution.
15
Gelatin is mostly used in masking ice-cream in order to
A
prevent forming the colloidal sol
B
enrich the fragrance
C
prevent crystallisation and stabilize the mix
D
modify the taste.
16
In which of the following respcets the lyophilic sols do not differ from lyophobic sols ?
A
Stability
B
Reversibility
C
Particle size
D
Behaviour towards dispersion medium.
17
Which of the following is true for a Gel?
A
Solid as disperse phase
B
Liquid as dispersion medium
C
Both of the above
D
None of these.
18
Which of the following statements is not true for physisorption?
A
Extent of adsorption increases with increases in temperature
B
Heat of adsorption is generally between 20-40 kJ/mole
C
It is not specific
D
It undergoes desorption easily.
19
Butter is a colloid containing
A
Fat disperesed in water
B
Fat disperesed in oil
C
Water dispersed in fat
D
None of these.
20
Lyophilic sols have .......... between disperese phase and dispersion.
A
strong attractive interaction
B
little attractive interaction
C
repulsive interaction
D
None of these.
21
Size of colloidal particles ranges between
A
1 nm to 100 nm
B
1 nm to 1000 nm
C
10 nm to 1000 nm
D
100 nm to 1000 nm.
22
The average molecular mass of colloidal particles can be determined by study of
A
Elevation in boiling point
B
Osmotic pressure
C
Tyndall effect
D
Lowering of vapour pressure.
23
Gold number is minimum for
A
Starch
B
Gelatin
C
Gum arabic
D
Albumin.
24
Hydrophilic sols are stable due to
A
Small size of the particle
B
Large size of the particle
C
Cgarge on the particle
D
Attractive interaction between colloidal particles and the dispersion mecium.
25
A colloidal solution may be coagulated by
A
Adding electrolyte
B
Adding oppositely charged sol
C
Heating
D
All of the above.
26
A graph of extent of adsorption versus pressure at constant temperature is called
A
Adsorption isobar
B
Adsorption isotherm
C
Adsorption isostere
D
None of these.
27
Which of the following metallic sols cannot be prepared by Bredigs arc method?
A
Gold
B
Silver
C
Platinum
D
Sodium.
28
Colloidal particles in soap sol carry
A
Negative charge
B
Positive cgarge
C
No charge
D
Either positive or negative charge.
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