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Free download in PDF Class 12 Chemistry Chapter 5 Surface Chemistry Multiple Choice Questions (MCQs) 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)
The movement of colloidal particles towards the oppositely charged electrodes on passing electric current is known as
[A]
Tyndall effect
[B]
Cataphoresis
[C]
Brownian movement
[D]
None of these
(2)
An emulsifier is a substance which
[A]
stabilizes the emulsion
[B]
coagulates the emulsion
[C]
retards the dispersion of liquid in liquid
[D]
causes homogenesis of emulsion
Answer: stabilizes the emulsion
(3)
Homogeneous catalysis does mean
[A]
Reactants and goods have to be at the same level
[B]
Catalyst and reactants must be in the same phase
[C]
The reaction mixture must be formed homogeneously during
[D]
The reaction mixture distribution must be homogeneous
Answer: Catalyst and reactants must be in the same phase
(4)
Which of the following kinds of catalysis can be explained by the adsorption theory?
[A]
enzyme catalysis
[B]
homogeneous catalysis
[C]
acid base catalysis
[D]
heterogeneous catalysis
Answer: heterogeneous catalysis
(5)
The volume of gases H2, CH4, CO2 and NH3 adsorbed by 1 gm charcoal at 293 K can be given in the order?
[A]
CH4 > CO2 > NH3 > H2
[B]
CO2 > NH3 > H2 > CH4
[C]
NH3 > CO2 > H2 > CH4
[D]
NH3 > CO2 > CH4 > H2
Answer: NH3 > CO2 > CH4 > H2
(6)
Which one of the following is an example of adsorption?
[A]
ammonia in contact with water
[B]
anhydrous CaCl2 with water
[C]
silica gel in contact with water vapours
[D]
all of these
Answer: silica gel in contact with water vapours
(7)
At 15oC out of H2, CH4, CO2, NH3, which gas will be adsorbed maximum by charcoal?
[A]
H2
[B]
CH4
[C]
CO2
[D]
NH3
(8)
Which of the following colloids are solvent hating?
[A]
lyophilic
[B]
lyophobic
[C]
hydrophilic
[D]
none of these
(9)
If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as
[A]
foam
[B]
sol
[C]
emulsion
[D]
gel
(10)
The process of separating a crystalloid, from a colloid by filtration is called
[A]
emulsification
[B]
dialysis
[C]
coagulation
[D]
Peptization
(11)
On which factors interface depends?
[A]
Size of the molecules in the bulk phase
[B]
Wieght of the molecules in the bulk phase
[C]
Numbers of molucules in the bulk phase
[D]
Physical state of molucules in the bulk phase
Answer: Size of the molecules in the bulk phase
(12)
Which of the following phenomenon in not involved in surface chemistry?
[A]
Elecrode reactions
[B]
Dissolution
[C]
Heterogeneous catalysis
[D]
Liquid and its vapour taken in closed vessel
(13)
How much pascal high vacuum is required to achive completely pure surface of metal?
[A]
10-8 to 10-9
[B]
10-8 to 10-10
[C]
10-6 to 10-9
[D]
10-8 to 10-7
(14)
Due to adsorption
[A]
surface energy increases
[B]
surface energy becomes zero
[C]
surface energy decreases
[D]
no change occurs in surface energy
Answer: surface energy becomes zero
(15)
Which of the following processes is adsortion phenomenon ?
[A]
Soakd of rayon clothes in coloured solution
[B]
Contact between silicagel and vapour of water
[C]
Contact between anhydrous CaCl2 and vapour of water
[D]
H2S gas in contact to water
Answer: H2S gas in contact to water
(16)
Which of the following is good adsorbent ?
[A]
Silica gel
[B]
Alumina
[C]
Clay
[D]
All the given
(17)
Which type of process adsorption is ?
[A]
Isotonic
[B]
Isochonic
[C]
Indothermic
[D]
Exothermic
(18)
When adsorption phenomenon occurs complete ?
[A]
ΔH < O,ΔG < O,ΔS < O
[B]
ΔG < O,ΔH < O,ΔS > O
[C]
ΔH > O,ΔS > O,ΔG < O
[D]
ΔG < O,ΔS < O,ΔH > O
Answer: ΔH < O,ΔG < O,ΔS < O
(19)
Which is correct for adsorption ?
[A]
Δ H-T Δ S is negative
[B]
ΔH is positive
[C]
Δ H-T Δ S is positive
[D]
TΔS and ΔG=0
Answer: Δ H-T Δ S is negative
(20)
Which of the following statement is not true ?
[A]
The value of adsorption enthalpy of physical adsorption is less than chemical adsorption
[B]
Physical adsorption occurs due to van der waals’ forces
[C]
Chemical adsorption decreases at high temperacture and low pressure
[D]
Physical adsorption is reversible
Answer: Chemical adsorption decreases at high temperacture and low pressure
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