The method usually employed for the precipitation of a colloidal solution is …[ AIMPT 2000]
23%
a) dialysis
57%
b) addition of electrolytes
15%
c) diffusion through animal membrane
5%
d) condensation
Q.2.
Peptisation is a process of ...
27%
a) precipitation of colloidal particles
15%
b) purification of colloids
54%
c) dispersing precipitate into colloidal particles in the electric filed
4%
d) movement of colloidal particles in the electric filed
Q.3.
If a beam of light is passed through true solution, then it is ..[ AIPMT 1995]
28%
a) visible
19%
b) scatter
53%
c) not visible
0%
d) none of the above
Q.4.
The process which is catalysed by one of the products formed during the reaction is known as
27%
a) acid catalysis
8%
b) anti catalysis
2%
c) negative catalysis
63%
d) auto-catalysis
Q.5.
If dispersion medium is water, the colloidal system is called ..
70%
a) aquasol
13%
b) aerosol
7%
c) organosol
11%
d) sol
Q.6.
Gelatin protects
20%
a) Gold Sol
8%
b) As2S3
2%
c) Fe(OH)3
70%
d) All of these
Q.7.
The false statement for hydrophilic sols is ...
9%
a) surface tension is lower than that of dispersion medium
14%
b) they do not require electrolytes for stability
60%
c) viscosity is of the order of that of water
17%
d) coagulation is reversible
Q.8.
Assertion: The activity of catalyst is more or less specific Reason: A catalyst for one reaction is not necessary to catalyse the other reaction
22%
a) Assertion and reason both are correct and Reason is correct explanation of Assertion
56%
b) Assertion and reason both are correct and Reason is not correct explanation of Assertion
16%
c) Assertion is correct but Reasoning is wrong
6%
d) Assertion is wrong but reason is correct
Q.9.
Which act(s) as negative catalyst?
10%
a) lead(lV) oxide in the decomposition of H2O2
16%
b) Mn2+ in the oxidation of oxalic acid by acidified KMnO4
68%
c) Lead tetraethyl as antiknock compound
6%
d) MnO2 in the decomposition of KClO3
Q.10.
Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]l- sol ? [NEET 2019]
7%
a) 50 mL of 1 M AgNO3 + 50 mL of 1.5 M KI
30%
b) 50 mL of 1 M AgNO3 + 50 mL of 2 M KI
57%
c) 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI
7%
d) 50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI
Q.11.
On which of the following properties does the coagulating power of an ion depend ? [NEET 2018]
31%
a) Both magnitude and sign of the charge on the ion
0%
b) Size of the ion alone
31%
c) The magnitude of the charge on the ion alone
38%
d) The sign of charge on the ion alone
Q.12.
Which property of colloidal solution is independent of charge on the colloidal particles? [ AIPMT 2014]
8%
a) Coagulation
8%
b) Electrophoresis
15%
c) Electroosmosis
69%
d) Tyndall effect
Q.13.
Which one of the following statements is incorrect about enzyme catalysis? [ AIPMT 2012]
4%
a) Enzymes are mostly proteinous in nature
0%
b) Enzyme action is specific
38%
c) Enzymes are denatured by UV-rays and at high temperature
58%
d) Enzymes are least reactive at optimum temperature
Q.14.
Which of the following metals sols cannot be prepared by Bredig's arc method?
4%
a) Copper
65%
b) Potassium
26%
c) Gold
4%
d) Platinum
Q.15.
Assertion: Zeolites are water softener as well as catalyst Reason: pores in a particular zeolite are of a fixed size and shape,
52%
a) Assertion and reason both are correct and Reason is correct explanation of Assertion
35%
b) Assertion and reason both are correct and Reason is not correct explanation of Assertion
13%
c) Assertion is correct but Reasoning is wrong
0%
d) Assertion is wrong but reason is correct
Q.16.
Gold number is minimum in case of ...
57%
a) Gelatin
13%
b) Egg albumin
4%
c) Gum arabic
26%
d) Starch
Q.17.
Which of the following statements is correct for the spontaneous adsorption of a gas? [ AIPMT 2014]
22%
a) Δ S is negative and therefore, ΔH should be highly positive
43%
b) Δ S is negative and therefore, ΔH should be highly negative
30%
c) Δ S is negative and therefore, ΔH should be negative
4%
d) Δ S is positive and therefore, ΔH should be highly positive
Q.18.
Which of the following is involved in dyeing of fibres
4%
a) absorption
38%
b) adsorption
27%
c) sorption
31%
d) all of these
Q.19.
The separation of colloidal particles ( or purification of sol) from particles of molecular dimensions is known as …[ Roorkee 1995]
67%
a) dialysis
5%
b) Pyrolysis
19%
c) Peptization
10%
d) Photolysis
Q.20.
Adsorption of a gas on solid metal surface is spontaneous and exothermic then: … [ IIT 2004]
9%
a) S increases
65%
b) S decreases
17%
c) H increases
9%
d) G increases
Q.21.
In a reversible reaction role of a catalyst is to
5%
a) increase rate of forward reaction only
36%
b) increase rate of forward reaction greater than extent that rate of backward reaction
41%
c) increases the rate of forward and backward reaction equally
18%
d) It increases the yield of reaction
Q.22.
Which one of the following is correctly matched?
15%
a) Emulsion - Curd
15%
b) Foam - Mist
60%
c) Aerosol - Smoke
10%
d) Solid sol - Cake
Q.23.
A negatively charged suspension of clay in water needs for precipitation the minimum amout of
28%
a) hydrochloric acid
39%
b) aluminium chloride
17%
c) sodium hydroxide
17%
d) potassium sulphate
Q.24.
Catalystic poisonears act by [ Roorkee 1991 ]
6%
a) Coagulating the catalyst
61%
b) getting adsorbed on the active centres on the surface of catalyst
11%
c) Chemical combination with any one of the ractants
22%
d) none of the above
Q.25.
Egg albumin is ...
21%
a) protective colloid
0%
b) lyophilic colloid
11%
c) reversible colloid
68%
d) all of these
Q.26.
Purple of cassius is
39%
a) colloidal solution of gold
11%
b) colloidal solution of silver
22%
c) colloidal solution of platinum
28%
d) oxyacids of gold
Q.27.
Which characteristic is the most important factor in giving rise to peculiar properties of colloids?
6%
a) Large size
0%
b) small size
24%
c) High charge density
71%
d) High ratio of surface area to the volume
Q.28.
Which of the following colloid can be prepared by electrical dispersion as well as reduction method
18%
a) Sulphur
6%
b) Ferric hydroxide
18%
c) Arsenious sulphide
59%
d) Gold
Q.29.
Hardy-Schulze rule says that ...
6%
a) non-electrolytes have better coagulating action of colloids than electrolytes
78%
b) Sol are coagulated by effective ions whose charge is opposite to that of sol and the ions of higher charge are much more effective than the ions of lower charge
6%
c) Charge of the ions has no effect on the coagulation of sol
11%
d) sols are coagulated only by those ions whose charge is similar to that of the sol
Q.30.
Which of the following is less than zero during adsorption?
17%
a) Δ G
11%
b) Δ S
22%
c) Δ H
50%
d) All of the above
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