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Free download in PDF Class 12 Chemistry Chapter 5 Surface Chemistry Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(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
(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
(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
(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
(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)
(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
(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)
(14)
Which catalyst is used to obtain methanal from water gas ?
[A]
Cu
[B]
ZnO-Cr2O3
[C]
(a) and (b)
[D]
FeO
(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
(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
(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
(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
(19)
Milk is example of which type of colloid ?
[A]
Emulsion
[B]
Suspension
[C]
Gel
[D]
Aerosol
(20)
Smoke is which type of colloidal system ?
[A]
Gas in salid
[B]
Solid in gas
[C]
Gas in gas
[D]
Gas in liquid
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