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Surface Chemistry Mcq Neet Chemistry
Quiz 2
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Q.1
Ultramicroscope works on the principle of ...
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a) light reflection
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b) light absorption
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c) light scattering
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d) light polarization
Explanation
Answer: (c)
Q.2
Rate of physisorption increases with … [ IIT 2003]
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a) Decrease in temperature
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b) Decrease in surface area
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c) Increase in temperature
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d) Decrease in pressure
Explanation
Answer: (a)
Q.3
The enzyme ptyalin used for digestion of food is present in ...
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a) saliva
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b) blood
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c) intestine
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d) adrenal glands
Explanation
Answer: (a)
Q.4
Which caharacteristic is not correct for physical adsprption? [ AIEEE 2003]
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a) Adsorption on solid is reversible
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b) Adsorption is spontaneous
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c) Adsorption increases with increase in temperature
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d) Both enthalpy and entropy change of adsorption are negative
Explanation
Answer: (c)
Q.5
Which of the following decomposes of urea in ammonia and carbon dioxide
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a) pepsin
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b) Cellulase
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c) urease
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d) trypsin
Explanation
Answer: (c)
Q.6
Lyophiliic sols are more stable than lyophobic sols because
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a) the colloidal particles have positive charge
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b) the colloidal particles negative charge
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c) the colloidal particles are solvated
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d) there are strong electrostatic repulsions between the negatively charged colloidal particles
Explanation
Answer: (c)
Q.7
Which process does not involve a catalyst? [ KCET 1991]
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a) Thermite process
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b) Ostwald's process
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c) Contact process
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d) Haber's process
Explanation
Answer: (a)
Q.8
The temerature above which micelle formation occurs is ...
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a) Inverson temerature
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b) Kraft's temerature
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c) Charles' temerature
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d) Caffeine
Explanation
Answer: (b)
Q.9
Protons accelerate the hydrolysis of esters. this is an example of
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a) a promoter
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b) a hetrogeneous catalyst
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c) an autocatalyst
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d) acid-base catalyst
Explanation
Answer: (d)
Q.10
Which acts as poison to platinum ( a catalyst) in the manufacture of H2SO4 by contact process?
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a) Arsenious oxide
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b) CO2
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c) CO
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d) Sodium sulphide
Explanation
Answer: (a)
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\
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a) Coagulation in both sol can be brought about by electrophoresis
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b) Na2SO4 solution causes coagulation in both sol
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c) Mixing of two sols have no effect
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d) MgCl2 solution coagulates gold sol readily than iron (IIII) hydroxide sol
Explanation
Answer: (c)
Q.12
According to Langmuir theory of adsorption
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a) amount of gas adsorbed goes on increasing with pressure
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b) the adsorbate molecules are held on the surface by chemical forces
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c) amount of gas adsorbed decreases and then increases with decrease of temperature
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d) amount of gas adsorbed goes on increasing with pressure
Explanation
Answer: (d)
Q.13
Colloidal solution commonly used in treatment of skin diseases is
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a) colloidal sulphur
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b) colloidal solver
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c) colloidal magnesium
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d) colloidal gold
Explanation
Answer: (a)
Q.14
Flocculation value is expressed in terms of
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a) millimole/ Litre
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b) mole/ Litre
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c) gram/ Litre
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d) mole/millilitre
Explanation
Answer :(a)
Q.15
Which of the following is not colloid?
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a) Chlorophyll
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b) Smoke
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c) Ruby glass
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d) Milk
Explanation
Answer: (a)
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.
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a) postive catalyst
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b) a promoter
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c) an autocatalyst
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d) noone of thse
Explanation
Answer: (c)
Q.17
Which statement is wrong?
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a) Reaction with higher activation energy has higher rate constant
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b) The catalyst does not alter the equilibrium of a reaction
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c) Half-life period of a first order reaction is independent of initial cooncentratiion
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d) In the endothermic reaction, the activation energy of the reaction is higher than that of heat of reaction
Explanation
Answer: (a)
Q.18
For the coagulation of 100mL of As2S3 sol, 5 ml of 1M NaCl is required. The flocculation value of NaCl is
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a) 50
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b) 5
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c) 47.6
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d) None of these
Explanation
1000 ml = 1 Mole solution of NaCl, thus in 5ml contains 5millimoles of NaCl Now NaCl is added to 100 mL of As2S3 Thus Volume of the sol containing NaCl solution = 100 mL Flocculation value is the amount of electrolyte (in millimoles) that must be added to 1L of the colloidal solution so as to bring about complete coagulation ∴ flocculation value of NaCl Answer: (a)
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]
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a) The adsorption is irreversible
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b) The adsorption is accompanied by a decrease in enthalpy
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c) The adsorption requires activation at 25&dgeC
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d) The adsorption increases with increase of temperature
Explanation
Answer: (b)
Q.20
The spontaneous outcome of internal liquid from gels is called
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a) swelling
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b) thixotropy
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c) synerisis
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d) all of these
Explanation
Answer: (c)
Q.21
A catalyst
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a) increases temperature
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b) changes the energy of activation
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c) affects the stste of equilibrium
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d) affects the forward and backward reactions of a reversible reaction differently
Explanation
Answer: (b)
Q.22
Which is used in the Haber's processs for the manufacture of NH3 [ Rootkee 1993]
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a) Fe + Mo
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b) Al2O3
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c) CuO
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d) Pt
Explanation
Answer: (a)
Q.23
Function of catalyst for a reversible reaction is to
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a) supplies energy to the reaction
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b) decreases the time to reach equiliibrium
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c) increases the equilibrium concentration of the products
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d) change the equilibrium constant of the reaction
Explanation
Answer: (b)
Q.24
dentify the correct statement regarding enzymes …[ AIEEE 2004]
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a) Enzymes are normally heterogeneous catalyst that are very specific in their action
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b) Enzymes are specific biological catalysts that can not be poisoned
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c) Enzymes are specific biological catalysts that can normally function at very high temperature ( T ≈ 1000K)
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d) Enzymes are specific biological catalyst that posses well defined active state
Explanation
Answer: (d)
Q.25
in homogeneous catalytic reactions, the rate of reaction
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a) depends on free energy
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b) depends on physical state of the catalyst
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c) depends on concentration of ctalyst
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d) independent of concentration of ctalyst
Explanation
Answer: (c)
Q.26
Which of the following is most effective in causing the coagulation of ferric hydroxide sol?
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a) KCl
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b) KNO3
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c) K2SO4
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d) K3[Fe(CN)6]
Explanation
Answer: (d)
Q.27
The critical micellization concentration (CMC) is
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a) the concentration at which miiscellization begins
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b) the concentration at which true solution beginss
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c) the concentration at which one molar electrolyte is present per 1000g of solution
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d) the concentration at which solute anda solution form equilibrium
Explanation
Answer: (a)
Q.28
According to the ‘adsorption theory of catalysis, the speed of the reaction increases because ..[ AIMPT 2003]
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a) adsorption produces hat which increases the speed of the reaction
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b) adsorption lowers the activation energy of the reaction
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c) the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
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d) in the process of adsorption, the activation energy of the molecules becomes large
Explanation
Answer: (b)
Q.29
If the dispered phase in a liquid and the dispersion medium is a solid, the colloid is known as
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a) a foam
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b) a sol
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c) an emulsion
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d) a gel
Explanation
Answer: (d)
Q.30
Which are correct in the case of enzyme catalysis?
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a) Enzyme work best at high temperature
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b) Enzyme work in acidic or basic medium
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c) Enzymes are highly specific for substrates
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d) Enzyme catalysis involves iincrease of activation energy
Explanation
Answer: (c)
0 h : 0 m : 1 s
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