Q.1
Ultramicroscope works on the principle of ...
  • a) light reflection
  • b) light absorption
  • c) light scattering
  • d) light polarization
Q.2
Rate of physisorption increases with … [ IIT 2003]
  • a) Decrease in temperature
  • b) Decrease in surface area
  • c) Increase in temperature
  • d) Decrease in pressure
Q.3
The enzyme ptyalin used for digestion of food is present in ...
  • a) saliva
  • b) blood
  • c) intestine
  • d) adrenal glands
Q.4
Which caharacteristic is not correct for physical adsprption? [ AIEEE 2003]
  • a) Adsorption on solid is reversible
  • b) Adsorption is spontaneous
  • c) Adsorption increases with increase in temperature
  • d) Both enthalpy and entropy change of adsorption are negative
Q.5
Which of the following decomposes of urea in ammonia and carbon dioxide
  • a) pepsin
  • b) Cellulase
  • c) urease
  • d) trypsin
Q.6
Lyophiliic sols are more stable than lyophobic sols because
  • a) the colloidal particles have positive charge
  • b) the colloidal particles negative charge
  • c) the colloidal particles are solvated
  • d) there are strong electrostatic repulsions between the negatively charged colloidal particles
Q.7
Which process does not involve a catalyst? [ KCET 1991]
  • a) Thermite process
  • b) Ostwald's process
  • c) Contact process
  • d) Haber's process
Q.8
The temerature above which micelle formation occurs is ...
  • a) Inverson temerature
  • b) Kraft's temerature
  • c) Charles' temerature
  • d) Caffeine
Q.9
Protons accelerate the hydrolysis of esters. this is an example of
  • a) a promoter
  • b) a hetrogeneous catalyst
  • c) an autocatalyst
  • d) acid-base catalyst
Q.10
Which acts as poison to platinum ( a catalyst) in the manufacture of H2SO4 by contact process?
  • a) Arsenious oxide
  • b) CO2
  • c) CO
  • d) Sodium sulphide
Q.11
The dispersed phase in colloidal ion(III) hydroxide and colloidal gold is positively and negatively charged respectively, which of the following statement is not correct …[ AIEEE 2005\
  • a) Coagulation in both sol can be brought about by electrophoresis
  • b) Na2SO4 solution causes coagulation in both sol
  • c) Mixing of two sols have no effect
  • d) MgCl2 solution coagulates gold sol readily than iron (IIII) hydroxide sol
Q.12
According to Langmuir theory of adsorption
  • a) amount of gas adsorbed goes on increasing with pressure
  • b) the adsorbate molecules are held on the surface by chemical forces
  • c) amount of gas adsorbed decreases and then increases with decrease of temperature
  • d) amount of gas adsorbed goes on increasing with pressure
Q.13
Colloidal solution commonly used in treatment of skin diseases is
  • a) colloidal sulphur
  • b) colloidal solver
  • c) colloidal magnesium
  • d) colloidal gold
Q.14
Flocculation value is expressed in terms of
  • a) millimole/ Litre
  • b) mole/ Litre
  • c) gram/ Litre
  • d) mole/millilitre
Q.15
Which of the following is not colloid?
  • a) Chlorophyll
  • b) Smoke
  • c) Ruby glass
  • d) Milk
Q.16
In the titration between oxalic acid and acidified potassium permanganate, the manganous salt formed during the reaction catalyses the reaction. The manganous salt acts as.
  • a) postive catalyst
  • b) a promoter
  • c) an autocatalyst
  • d) noone of thse
Q.17
Which statement is wrong?
  • a) Reaction with higher activation energy has higher rate constant
  • b) The catalyst does not alter the equilibrium of a reaction
  • c) Half-life period of a first order reaction is independent of initial cooncentratiion
  • d) In the endothermic reaction, the activation energy of the reaction is higher than that of heat of reaction
Q.18
For the coagulation of 100mL of As2S3 sol, 5 ml of 1M NaCl is required. The flocculation value of NaCl is
  • a) 50
  • b) 5
  • c) 47.6
  • d) None of these
Q.19
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is …[ JEE 2013]
  • a) The adsorption is irreversible
  • b) The adsorption is accompanied by a decrease in enthalpy
  • c) The adsorption requires activation at 25&dgeC
  • d) The adsorption increases with increase of temperature
Q.20
The spontaneous outcome of internal liquid from gels is called
  • a) swelling
  • b) thixotropy
  • c) synerisis
  • d) all of these
Q.21
A catalyst
  • a) increases temperature
  • b) changes the energy of activation
  • c) affects the stste of equilibrium
  • d) affects the forward and backward reactions of a reversible reaction differently
Q.22
Which is used in the Haber's processs for the manufacture of NH3 [ Rootkee 1993]
  • a) Fe + Mo
  • b) Al2O3
  • c) CuO
  • d) Pt
Q.23
Function of catalyst for a reversible reaction is to
  • a) supplies energy to the reaction
  • b) decreases the time to reach equiliibrium
  • c) increases the equilibrium concentration of the products
  • d) change the equilibrium constant of the reaction
Q.24
dentify the correct statement regarding enzymes …[ AIEEE 2004]
  • a) Enzymes are normally heterogeneous catalyst that are very specific in their action
  • b) Enzymes are specific biological catalysts that can not be poisoned
  • c) Enzymes are specific biological catalysts that can normally function at very high temperature ( T ≈ 1000K)
  • d) Enzymes are specific biological catalyst that posses well defined active state
Q.25
in homogeneous catalytic reactions, the rate of reaction
  • a) depends on free energy
  • b) depends on physical state of the catalyst
  • c) depends on concentration of ctalyst
  • d) independent of concentration of ctalyst
Q.26
Which of the following is most effective in causing the coagulation of ferric hydroxide sol?
  • a) KCl
  • b) KNO3
  • c) K2SO4
  • d) K3[Fe(CN)6]
Q.27
The critical micellization concentration (CMC) is
  • a) the concentration at which miiscellization begins
  • b) the concentration at which true solution beginss
  • c) the concentration at which one molar electrolyte is present per 1000g of solution
  • d) the concentration at which solute anda solution form equilibrium
Q.28
According to the ‘adsorption theory of catalysis, the speed of the reaction increases because ..[ AIMPT 2003]
  • a) adsorption produces hat which increases the speed of the reaction
  • b) adsorption lowers the activation energy of the reaction
  • c) the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
  • d) in the process of adsorption, the activation energy of the molecules becomes large
Q.29
If the dispered phase in a liquid and the dispersion medium is a solid, the colloid is known as
  • a) a foam
  • b) a sol
  • c) an emulsion
  • d) a gel
Q.30
Which are correct in the case of enzyme catalysis?
  • a) Enzyme work best at high temperature
  • b) Enzyme work in acidic or basic medium
  • c) Enzymes are highly specific for substrates
  • d) Enzyme catalysis involves iincrease of activation energy
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