Q.1
The protecting power of lyophilic colloidal sol is expressed in terms of …[ AIPMT 2012]
  • a) coagulation value
  • b) gold number
  • c) critical micelle concentration
  • d) oxidation number
Q.2
Which is not a colloid?
  • a) Egg white
  • b) Chlorophyll
  • c) Milk
  • 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]
  • a) Al2(SO4)3
  • b) NH4Cl
  • c) CaCl2.
  • d) Na2SO4,
Q.4
AlCl3 in Friedel-Craft reaction acts as
  • a) oxidizing agent
  • b) reducing agent
  • c) acid catalyst
  • d) none of these
Q.5
A catalyst is a substance which …[ IIT 1984]
  • a) changes the equilibrium conc. Of reaction
  • b) supplied the energy of the reaction
  • c) Increases equilibrium constant of reaction
  • 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]
  • a) x/m = f(T) at constant p
  • b) p = f(T) at constant (x/m)
  • c) x/m = p ×T
  • d) x/m = f(p) at constant T
Q.7
During dialysis
  • a) only solvent molecules can diffuse
  • b) Solvent molecules, ions and colloidal particles anc diffuse
  • c) all kinds of particles can diffuse through the semipermeable membrane
  • d) solvent molecules and ions can diffuse
Q.8
Which acts as a promoter foor nickel in the hydrogenation of oils?
  • a) Cu
  • b) vanadium
  • c) Pt
  • d) Fe
Q.9
Which is not correct regarding the adsorption of gas on surface of solid? [ AIPMT 2001]
  • a) On increasing temperature adsorption increases continuously
  • b) Enthalpy and entropy changes change is negative
  • c) Adsorption is more for some specific substance
  • d) Reversible
Q.10
Which statement about enzymes is not correct?
  • a) Enzymes are in colloidal state
  • b) Enzymes are catalysts
  • c) Enzymes can catalyse any reaction
  • d) Urease is an enzyme
Q.11
The protective power of lyophilic sol is
  • a) Dependent on the size of colloidal particles
  • b) expressed in terns of gold number
  • c) expressed as x/m
  • 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 ..
  • a) Pt
  • b) Fe
  • c) Cu
  • d) Ni
Q.13
Lyophilic sols are : [ IIT 2005]
  • a) Not coagulated by adding electrolytes
  • b) Irreversible sols
  • c) They are prepared from inorganic compounds
  • d) Self stabilizing
Q.14
The Brownian motion is due to ... ...
  • a) temperature fluctuation within the liquid phase
  • b) attraction and repulsion between charges on the colloidal particles
  • c) due to their collisions with other atoms or molecules
  • 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
  • a) R, Q, P, Q
  • b) O, P, Q, R
  • c) P, Q, R, Q
  • d) Q, R, O, P
Q.16
The reactions in which catalyst and reactant have one phase are known as
  • a) gaseous reaction
  • b) heterogeneous catalytic reaction
  • c) homogeneous catalytic reaction
  • d) none of the above
Q.17
Which of the following statements is incorrect regarding physisorptions? [ AIEEE 2009]
  • a) It occurs because of van der Waals’ forces
  • b) More easily liquefiable gases are adsorbed readily
  • c) Enthalpy of adsorption ( ΔHadsorption) is low and positive
  • d) Under high pressure it results into
Q.18
Reason for the effect of catalyst on the rate of reaction reversible reaction is
  • a) It increases the kinetic energy of reactant molecules
  • b) It lowers the equilibrium conatsnt
  • c) It decreases the rate of reverse reactioon
  • d) It provides a new reaction pathway with lower activation energy
Q.19
A catalyst … [ IIT 1983]
  • a) Alters the reaction mechanism
  • b) Increases the frequency of collisions of the reacting species
  • c) Increases the average kinetic energy of the reactiong molecules
  • d) Increases the activation energy
Q.20
According to freundlich adsorption isotherm, which of the following is correct?
  • a) x/m ∝ p1
  • b) x/m ∝ p1/m
  • c) x/m ∝ p0
  • d) All the above are correct for different ranges of pressure
Q.21
Which statement is correct?
  • a) Physical adsorption is multi-layer, non-directional and non-specific
  • b) Chemical adsorption is unilayer
  • c) Chemical adsorption is more stronger than physical adsorption
  • 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]
  • a) CH3(CH2)11OS3- Na+
  • b) CH3(CH2)15N+ (CH3)3 Br-
  • c) CH3(CH2)11 M+ (CH3)3 Br-
  • d) CH3(CH2)6COO3- Na+
Q.23
Which statements are correct for physical adsorption?
  • a) It is multilayer, non-directiional and non-specific
  • b) Endothermic ΔH = +20 to +40 kJ/mol
  • c) Exothermic with Δ H = -1000 kJ/mol
  • d) It is irreversible process
Q.24
Solvent loving colloids are
  • a) lyophilic
  • b) lyophilic colloid
  • c) hydrophobic colloid
  • 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
  • a) peptisation
  • b) dialysis
  • c) protective action
  • d) dissolution
Q.26
The size of the colloid particles is ...
  • a) > suspension particles
  • b) < suspension particles
  • c) < true solution particles
  • d) none of these
Q.27
Chemisorption is ...
  • a) multimolecular in nature
  • b) reversible
  • c) often highly specific and directional
  • d) not very specific
Q.28
The arsenious sulphide sol has negative charge. The maximum coagulation power for precipitating it is of … [ Roorkee 1990]
  • a) 0.1 N Na3PO4
  • b) 0.1 N Zn(NO3)2
  • c) 0.1 N ZaSO4
  • d) 0.1 N AlCl3
Q.29
Enzymes are ....
  • a) Substances made by chemists to activate washing powder
  • b) very active vegetable catalysts
  • c) catalysts found in organisms
  • d) synthetic catalysts
Q.30
The examples of aersol are
  • a) air bubble
  • b) pumice stone
  • c) egg yolk
  • d) cloud
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