12th Chemistry chapter 5 Bihar board with NCERT-Details & Highlights
name of content | 12th Chemistry chapter 5 full solution |
content | Chemistry objective type MCQ question with answer |
name of subjects | class 12 Chemistry |
important for exam | Bihar board & other state board |
pattern & Level | NCERT & State level question |
12th Chemistry chapter 5 all objective solutions – download PDF
1. Which of the following is less than zero during adsorption ?
-
- (a) ΔG
- (b) ΔS
- (c) ΔH
- (d) All of these
Ans (D)
2. Which of the following is a property of physisorption ?
-
- (a) High specificity
- (b) Irreversibility
- (c) Non-specificity
- (d) None of these
Ans (C)
3. Which of the following statement is not correct about physisorption ?
-
- (a) It is a reversible process
- (b) It requires less heat of adsorption
- (c) It requires activation energy
- (d) It takes place at low temperature
Ans (C)
4. The incorrect statement about physical adsorption is
-
- (a) it lacks specificity
- (b) it is generally reversible
- (c) porous surfaces are good adsorbent
- (d) heat of adsorption is quite high
Ans (D)
5. Which is correct in case of van der Waals adsorptions ?
-
- (a) High temperature, low pressure
- (b) High temperature, high pressure
- (c) Low temperature, low pressure
- (d) Low temperature, high pressure
Ans (D)
6. Which, of the following gases is least absorbed on charcoal ?
-
- (a)HCl
- (b) NH3
- (c) O2
- (d) CO2
Ans (C)
7. Which of the following is not characteristic of chemisorption ?
-
- (a) Adsorption is specific
- (b) Heat of adsorption is of the order of 200 kJ mol-1
- (c) Adsorption is irreversible
- (d) Adsorption may be multimolecular layers
Ans (D)
8. Which of the following is not correct regarding the adsorption of a gas on the surface of solid ?
-
- (a) On increasing pressure, adsorption keeps on increasing
- (b) Enthalpy and entropy changes are negative
- (c) Chemisorption is more specific than physisorption
- (d) It is a reversible reaction
Ans (A)
9. At low pressure, the fraction of the surface covered follows
-
- (a) zero-order kinetics
- (b) first order kinetics
- (c) second order kinetics
- (d) fractional order kinetics
Ans (B)
10. Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask ?
-
- (a) H2
- (b) O3
- (c) N2
- (d) SO2
Ans (D)
12th chemistry chapter 5 most mcq solution
11. Which of the following is application of adsorption in chemical analysis
-
- (a) Adsorption indicators
- (b) Thin layer chromatography
- (c) Qualitative analysis
- (d) All of these
Ans (D)
12. What is the role of adsorption in froth floatation process used especially for concentration of sulphide ores ?
-
- (a) Shape selective catalysts
- (b) Adsorption of pine oil on sulphide ore particles
- (c) Adsorption of pine oil on impurities
- (d) Production of heat in the process of exothermic reaction
Ans (B)
13. Which of the following can adsorb larger volume of hydrogen gas ?
-
- (a) Finely divided platinum
- (b) Colloidal solution of palladium
- (c) Small pieces of palladium
- (d) A single metal surface of platinum
Ans (B)
14. Which kind of catalysis can be explained on the basis of adsorption theory ?
-
- (a) Homogeneous catalysis
- (b) Heterogeneous catalysis
- (c) Negative catalysis
- (d) Auto catalysis
Ans (B)
15. The oxide of nitrogen which acts as a catalyst in lead chamber proces is …………
-
- (a) NO
- (b) NO2
- (c) N2O4
- (d) N2O5
Ans (A)
16. Shape-selective catalysis is a reaction catalysed by …………….
-
- (a) zeolites
- (b) enzymes
- (c) platinum
- (d) Ziegler-Natta catalyst
Ans (A)
17. The activity of an enzyme becomes ineffective ……….
-
- (a) at low temperature
- (b) at atmospheric pressure
- (c) at high temperature
- (d) in aqueous medium
Ans (C)
18. The size of colloidal particles ranges between ………….
-
- (a) 10-7 – 10-9cm
- (b) 10-9 -101 cm
- (c) 10-5 – 10-7cm
- (d) 10-2 – 10-3cm
Ans (C)
19. Which of the following will not form a colloidal system ?
-
- (a) Solid-gas
- (b) Liquid-gas
- (c) Gas-gas
- (d) Gas-liquid
Ans (C)
20. Fog is an example of colloidal system of ………….
-
- (a) liquid in gas
- (b) gas in liquid
- (c) solid in gas
- (d) gas in solid
Ans (A)
Bihar Board objective solution 12th chemistry chapter 5
21. A colloidal system in which liquid is dispersed phase and solid is dispersion medium is classified as ………….
-
- (a) gel
- (b) sol
- (c) emulsion
- (d) aerosol
Ans (A)
22. Which of the following example is correctly matched ?
-
- (a) Butter – gel
- (b) Smoke – emulsion
- (c) Paint – foam
- (d) Milk – aerosol
Ans (A)
23. Which of the following factors contribute towards higher stability of lyophilic colloid ?
-
- (a) Charge on their particles
- (b) Attractive forces between particles
- (c) Small size of their particles
- (d) High solvation due to a layer of dispersion medium
Ans (D)
24. A lyophobic colloid cannot be formed by ………….
-
- (a) mixing dispersed phase and dispersion medium
- (b) chemical reactions like hydrolysis
- (c) exchange of solvent
- (d) geptisation
Ans (A)
25. Which of the following is not correctly matched ?
-
- (a) Gelatin – Lyophilic colloid
- (b) Gold sol – Lyophilic colloid
- (c) Arsenious sulphide – Lyophobic colloid
- (d) Ferric hydroxide – Lyophobic colloid
Ans (B)
26. The substances which behave as colloidal solutions at higher concentration are called ………….
-
- (a) associated colloids
- (b) multimolecular colloids
- (c) macromolecular colloids
- (d) protective colloids
Ans (A)
27. The formation of micelles takes place only above …………..
-
- (a) critical temperature
- (b) Kraft temperature
- (c) inversion temperature
- (d) absolute temperature
Ans (B)
28. The critical micelle concentration (CMC) is defined as…………….
-
- (a) the concentration at which micellization starts
- (b) the concentration at which micelle starts behaving like an electrolyte
- (c) the concentration at which dispersed phase is separated from dispersion medium
- (d) the concentration at which a colloid is converted to suspension
Ans (A)
29. Soap mixed with water below critical micelle concentration behaves as
-
- (a) associated colloid
- (b) macromolecular colloid
- (c) normal electrolytic solution
- (d) multimolecular colloid
Ans (C)
30. White of an egg whipped with water acts as …………………
-
- (a) macromolecular colloid
- (b) associated colloid
- (c) molecular colloid
- (d) normal electrolytic solution
Ans (A)
BSEB 12th chemistry chapter 5 most mcq notes solution
31. Which of the following is not a method of removing impurities from a colloidal sol ?
-
- (a) Electrodialysis
- (b) Ultrafiltration
- (c) Ultra centrifugation
- (d) Distillation
Ans (D)
32. Tyndall effect is not observed in ………………
-
- (a) smoke
- (b) emulsions
- (c) sugar solution
- (d) gold sol
Ans (C)
33. Which of the following systems will show Tyndall effect ?
-
- (a) Aqueous solution of sodium chloride
- (b) Aqueous solution of aluminium hydroxide
- (c) Aqueous solution of glucose
- (d) Aqueous solution of urea
Ans (B)
34. Which of the following is not an explanation for the origin of charge on the colloidal particles ?
-
- (a) Due to frictional electrification
- (b) Due to dissociation of surface molecules
- (c) Due to electrophoresis
- (d) Due to selective adsorption of ions
Ans (C)
35. Movement of dispersion medium under the influence of electric field is known as ……………
-
- (a) electrodialysis
- (b) electrophoresis
- (c) electroosmosis
- (d) cataphoresis
Ans (C)
36. Why is alum added to water containing suspended impurities ?
-
- (a) To make a colloidal solution
- (b) To coagulate the suspended impurities
- (c) To remove impurities of calcium and magnesium
- (d) To protect the colloidal solution from getting precipitated
Ans (B)
37. Which of the following acts as the best coagulating agent for ferric hydroxide sol ?
-
- (a) Potassium ferrocyanide
- (b) Potassium chloride
- (c) Potassium oxalate
- (d) Aluminium chloride
Ans (A)
38. Why is gelatin mixed with gold sol ?
-
- (a) Gold sol is lyophobic sol, gelatin acts as stabilising agent
- (b) Gold sol is lyophilic sol, gelatin acts as stabilising agent
- (c) Gelatin produces negative charge on gold particles in gold sol
- (d) Gelatin helps gold sol to get its critical micelle concentration
Ans (A)
39. Which of the following is not a method for coagulation of lyophobic sols ?
-
- (a) By electrophoresis
- (b) By mixing oppositely charged sols
- (c) By adding electrolyte
- (d) By adding a protective colloid
Ans (D)
40. What happens when a lyophilic sol is added to a lyophobic sol ?
-
- (a) Lyophilic sol is protected
- (b) Lyophobic sol is protected
- (c) Both the sols are coagulated
- (d) Electrophorsis takes place
Ans (B)
Important most mcq solution 12th chemistry chapter 5
41. Which of the following is not an example of an emulsifying agent ?
-
- (a) Proteins
- (b)Gums
- (c) Soaps
- (d) Electrolytes
Ans (D)
42. The separation of an emulsion into its constituent liquids is known as
-
- (a) emulsification
- (b) protection of colloid
- (c) coagulation
- (d) demulsification
Ans (D)
43. Which of the following processes does not occur at the interface of phases ?
-
- (a) Crystallisation
- (b) Heterogeneous catalysis
- (c) Homogeneous catalysis
- (d) Corrosion
Ans (C)
44. At the equilibrium position in the process of adsorption …………
-
- (a) ΔH > 0
- (b) ΔH = TΔS
- (c) ΔH>TΔS
- (d) ΔH<TΔS
Ans (B)
45. Which of the following interfaces cannot be obtained ?
-
- (a) Liquid-Liquid
- (b) Solid-Liquid
- (c) Liquid-Gas
- (d) Gas-Gas
Ans (D)
46. The term ‘sorption’ stands for………………
-
- (a) absorption
- (b) adsorption
- (c) both absorption and adsorption
- (d) desorption
Ans (C)
47. Which of the following is not a favourable condition for physical adsorption ?
-
- (a) High pressure
- (b) Negative ΔH
- (c) Higher critical temperature of adsorbate
- (d) High temperature
Ans (D)
48. Physical adsorption of a gaseous species may change to chemical adsorption with……………
-
- (a) decrease in temperature
- (b) increase in temperature
- (c) increase in surface area of adsorbent
- (d) decrease in surface area of adsorbent
Ans (B)
49. Which of the following is an example of absorption ?
-
- (a) Water on silica gel
- (b) Water on calcium chloride
- (c) Hydrogen on finely divided nickel
- (d) Oxygen on metal surface
Ans (B)
50. At high concentration of soap in water, soap behaves as ……..
-
- (a) molecular colloid
- (b) associated colloid
- (c) macromolecular colloid
- (d) lyophilic colloid
Ans (B)
51. Freshly preparad precipitate sometimes gets converted to colloidal solution by …………..
-
- (a) coagulation
- (b) electrolysis
- (c) diffusion
- (d) peptisation
Ans (D)
52. Which of the following process is responsible for the formation of delta at a place where rivers meet the sea ?
-
- (a) Emulsification
- (b) Colloid formation
- (c) Coagulation
- (d) Peptisation
Ans (C)
53. Which of the following process is not responsible for the presence of electric charge on the sol particles ?
-
- (a) Electron capture by sol particles
- (b) Adsorption of ionic species from solution
- (c) Formation of Helmholtz electrical double layer
- (d) Adsorption of ionic species from solution
Ans (D)
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