The protecting power of lyophilic colloidal sol is expressed in terms of …[ AIPMT 2012]
17%
a) coagulation value
33%
b) gold number
33%
c) critical micelle concentration
17%
d) oxidation number
Q.2.
Which is not a colloid?
14%
a) Egg white
86%
b) Chlorophyll
0%
c) Milk
0%
d) Ruby glass
Q.3.
Among the electrolytes Na2SO4, CaCl2., Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is … [ IIT 2009]
100%
a) Al2(SO4)3
0%
b) NH4Cl
0%
c) CaCl2.
0%
d) Na2SO4,
Q.4.
AlCl3 in Friedel-Craft reaction acts as
20%
a) oxidizing agent
60%
b) reducing agent
20%
c) acid catalyst
0%
d) none of these
Q.5.
A catalyst is a substance which …[ IIT 1984]
0%
a) changes the equilibrium conc. Of reaction
0%
b) supplied the energy of the reaction
50%
c) Increases equilibrium constant of reaction
50%
d) Shortens the time to reach equilibrium
Q.6.
If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process? [ AIPMT 2001]
0%
a) x/m = f(T) at constant p
33%
b) p = f(T) at constant (x/m)
67%
c) x/m = p ×T
0%
d) x/m = f(p) at constant T
Q.7.
During dialysis
20%
a) only solvent molecules can diffuse
40%
b) Solvent molecules, ions and colloidal particles anc diffuse
40%
c) all kinds of particles can diffuse through the semipermeable membrane
0%
d) solvent molecules and ions can diffuse
Q.8.
Which acts as a promoter foor nickel in the hydrogenation of oils?
0%
a) Cu
75%
b) vanadium
25%
c) Pt
0%
d) Fe
Q.9.
Which is not correct regarding the adsorption of gas on surface of solid? [ AIPMT 2001]
25%
a) On increasing temperature adsorption increases continuously
25%
b) Enthalpy and entropy changes change is negative
0%
c) Adsorption is more for some specific substance
50%
d) Reversible
Q.10.
Which statement about enzymes is not correct?
0%
a) Enzymes are in colloidal state
50%
b) Enzymes are catalysts
50%
c) Enzymes can catalyse any reaction
0%
d) Urease is an enzyme
Q.11.
The protective power of lyophilic sol is
0%
a) Dependent on the size of colloidal particles
80%
b) expressed in terns of gold number
20%
c) expressed as x/m
0%
d) directly proportional to the magnitude of charge on it
Q.12.
Which of the following catalsy can be used in the contact process of sulphuric acid ..
67%
a) Pt
0%
b) Fe
33%
c) Cu
0%
d) Ni
Q.13.
Lyophilic sols are : [ IIT 2005]
20%
a) Not coagulated by adding electrolytes
20%
b) Irreversible sols
0%
c) They are prepared from inorganic compounds
60%
d) Self stabilizing
Q.14.
The Brownian motion is due to ... ...
0%
a) temperature fluctuation within the liquid phase
20%
b) attraction and repulsion between charges on the colloidal particles
40%
c) due to their collisions with other atoms or molecules
40%
d) concective current
Q.15.
The gold numbers of four protective colloids O, P, Q and R are 0.005, 0.01, 0.1 and 0.5 respectively. the decreasing order of their protective power is
0%
a) R, Q, P, Q
60%
b) O, P, Q, R
40%
c) P, Q, R, Q
0%
d) Q, R, O, P
Q.16.
The reactions in which catalyst and reactant have one phase are known as
0%
a) gaseous reaction
0%
b) heterogeneous catalytic reaction
100%
c) homogeneous catalytic reaction
0%
d) none of the above
Q.17.
Which of the following statements is incorrect regarding physisorptions? [ AIEEE 2009]
0%
a) It occurs because of van der Waals’ forces
33%
b) More easily liquefiable gases are adsorbed readily
33%
c) Enthalpy of adsorption ( ΔHadsorption) is low and positive
33%
d) Under high pressure it results into
Q.18.
Reason for the effect of catalyst on the rate of reaction reversible reaction is
0%
a) It increases the kinetic energy of reactant molecules
0%
b) It lowers the equilibrium conatsnt
33%
c) It decreases the rate of reverse reactioon
67%
d) It provides a new reaction pathway with lower activation energy
Q.19.
A catalyst … [ IIT 1983]
0%
a) Alters the reaction mechanism
33%
b) Increases the frequency of collisions of the reacting species
67%
c) Increases the average kinetic energy of the reactiong molecules
0%
d) Increases the activation energy
Q.20.
According to freundlich adsorption isotherm, which of the following is correct?
33%
a) x/m ∝ p1
0%
b) x/m ∝ p1/m
33%
c) x/m ∝ p0
33%
d) All the above are correct for different ranges of pressure
Q.21.
Which statement is correct?
0%
a) Physical adsorption is multi-layer, non-directional and non-specific
0%
b) Chemical adsorption is unilayer
67%
c) Chemical adsorption is more stronger than physical adsorption
33%
d) All of the above
Q.22.
Among the following surfactant molecules, the surfactant that forms micelles in aqueous solution at the lower CMC at ambient conduction is …[ IIIT 2008]
33%
a) CH3(CH2)11OS3- Na+
0%
b) CH3(CH2)15N+ (CH3)3 Br-
67%
c) CH3(CH2)11 M+ (CH3)3 Br-
0%
d) CH3(CH2)6COO3- Na+
Q.23.
Which statements are correct for physical adsorption?
67%
a) It is multilayer, non-directiional and non-specific
0%
b) Endothermic ΔH = +20 to +40 kJ/mol
33%
c) Exothermic with Δ H = -1000 kJ/mol
0%
d) It is irreversible process
Q.24.
Solvent loving colloids are
0%
a) lyophilic
67%
b) lyophilic colloid
33%
c) hydrophobic colloid
0%
d) none of these
Q.25.
On adding few drops of dil. HCl to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. This phenomenon is known as
50%
a) peptisation
25%
b) dialysis
25%
c) protective action
0%
d) dissolution
Q.26.
The size of the colloid particles is ...
25%
a) > suspension particles
25%
b) < suspension particles
25%
c) < true solution particles
25%
d) none of these
Q.27.
Chemisorption is ...
0%
a) multimolecular in nature
0%
b) reversible
67%
c) often highly specific and directional
33%
d) not very specific
Q.28.
The arsenious sulphide sol has negative charge. The maximum coagulation power for precipitating it is of … [ Roorkee 1990]
50%
a) 0.1 N Na3PO4
25%
b) 0.1 N Zn(NO3)2
25%
c) 0.1 N ZaSO4
0%
d) 0.1 N AlCl3
Q.29.
Enzymes are ....
33%
a) Substances made by chemists to activate washing powder
0%
b) very active vegetable catalysts
67%
c) catalysts found in organisms
0%
d) synthetic catalysts
Q.30.
The examples of aersol are
33%
a) air bubble
0%
b) pumice stone
33%
c) egg yolk
33%
d) cloud
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