12th Chemistry chapter 5: full solution, notes, MCQ, & free PDF | Bihar board

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12th Chemistry chapter 5: cover all important question with new latest pattern. you can download Chemistry chapter 5 notes & full solution as PDF format in English. below we are goin to cover chapter 5 Chemistry class 12 Bihar board
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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 ?

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    • (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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