Class 12 Chemistry Chapter 5 Surface Chemistry MCQs | Class 12 Chemistry Chapter 5 Surface Chemistry Multiple Choice Questions (MCQs) and Answers

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Questions
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

Answer:Cataphoresis
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

Answer:NH3
8 Which of the following colloids are solvent hating?
A lyophilic
B lyophobic
C hydrophilic
D none of these

Answer:lyophobic
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

Answer:gel
10 The process of separating a crystalloid, from a colloid by filtration is called
A emulsification
B dialysis
C coagulation
D Peptization

Answer:dialysis
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

Answer: Dissolution
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

Answer: 10-8 to 10-9
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

Answer: All the given
17 Which type of process adsorption is ?
A Isotonic
B Isochonic
C Indothermic
D Exothermic

Answer: 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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