Class 12 Chemistry Chapter 5 Surface Chemistry MCQs | Class 12 Chemistry Chapter 5 Surface Chemistry Objective Type Questions and Answers

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Questions
1 At which temperature chemical adsorption occurs ?
A At high temperature
B At very low temperature
C At low temperature
D Temperature does not affect

Answer:At high temperature
2 Whose value is less than zero during adsoption ?
A DG
B ΔH
C ΔS
D All the given

Answer:All the given
3 How molecules of gases are deposited on the surface of solid during physical adsorption ?
A By electrostatic forces
B By chemical forces
C By gravitational forces
D By van der waals’ forces

Answer: By van der waals’ forces
4 What is used to prevante electronic instruments clamaged by the moisture ?
A Silica gel
B Zeolite
C Chromatographic plate
D All the given

Answer:Silica gel
5 On which factor adsorption of gas on solid adsorbtion depend ?
A On temprature
B On pressure of gas
C On nature of adsorbent
D All the given

Answer: All the given
6 Which of the following is not true regarding to Freudlich adsorption isotherm ?
A This isotherm is applicable in certain limit of pressure
B Constant k and n change with temprature
C It shows deviation at low pressure
D Freundlich isotherm is empirical, there is no theoritical proof of it

Answer:It shows deviation at low pressure
7 In Indothermic reaction with the increase of temperature adsorption will be
A constsnt
B increase
C decrease
D none of these

Answer:increase
8 Which adsorbent is used in separation of inert gases by Dewar’s method ?
A Vanadium pentoxide
B Silica gel
C Activated charcoal
D Allumina

Answer:Activated charcoal
9 Which of the following are adsorption indicators ?
A eosin
B fluorescin
C methelene blue
D (a) and (b)

Answer: (a) and (b)
10 What is not true for catalytic reaction ?
A Catalyst increases equally both the rate of forward and reverse reactions
B Catalyst does not effect to equilibrium constant
C Catalyst decreases activation energy
D Catalyst increases activation energy of chemical equation

Answer: Catalyst increases activation energy of chemical equation
11 Which catalyst forms NH3 and CO2 from urea ?
A Invertase
B Celluase
C Urease
D Pepcine

Answer: Urease
12 Which of the following is an example of surface catalysis ?
A Inversion of sucrose
B Production of ammonia by Haber’s process
C Production of H2SO4 by lead chamber process
D Hydrolysis of ester

Answer: Production of ammonia by Haber’s process
13 Which catalyst is used in inversion of sucrose ?
A Fe(s)
B NO(g)
C H2SO4
D Cl(g)

Answer: NO(g)
14 Which catalyst is used to obtain methanal from water gas ?
A Cu
B ZnO-Cr2O3
C (a) and (b)
D FeO

Answer:ZnO-Cr2O3
15 On which factor shape-selective catalysis depends ?
A Size of reactant malecules
B Pore structure of catalyst
C Size of product molecules
D All the given

Answer:All the given
16 How many times reaction rate increase by catalyst ?
A 1010 to 1020
B 102 to 104
C 106 to 108
D 108 to 1020

Answer: 108 to 1020
17 What is called colloid system in which dispesing phase and dispersion medium, both are in solid state ?
A Gel
B Emulsion
C Sol
D Aerosol

Answer:Sol
18 What is called colloid system in which dispersing phase is gas and dispersion medium is lquid ?
A Gel
B Areosol
C Emulsion
D Foam

Answer: Foam
19 Milk is example of which type of colloid ?
A Emulsion
B Suspension
C Gel
D Aerosol

Answer: Emulsion
20 Smoke is which type of colloidal system ?
A Gas in salid
B Solid in gas
C Gas in gas
D Gas in liquid

Answer: Gas in salid

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