NCERT Class 12 Chemistry Questions & Answers for NEET

NCERT Class 12 Chemistry Short Questions & Answers For NEET

NCERT Class 12 Chemistry Questions & Answers NCERT Solutions For Class 12 Chemistry Chapter 5 Surface Chemistry Important Questions for Class 12 Chemistry Surface Chemistry Class 12 Important Questions

26. In Preparation of Fe(OH)2 colloid, FeCl, act as a 

(a) Precipitating agent (b) Peptizing agent 

(c) Coagulating agent (d) All of these 

27. For dialysis which of the following is required 

(a) Filter paper 

(b) Special filters 

(c) Semipermeable membrane (d) All of these 

28. Brownian movement is due to particles 

(a) Movement of dust particles in air 

(b) Continuous zig-zag movement of colloidal 

(c) Movement of particles in blood 

(d) All of these 

29. Brownian Movement is due to 

(a) Unequal bombardment of particles of dispersion medium with the dispersed phase. 

(b) Unequal bombardment of particles of dispersed phase with walls of container. 

(c) Unequal bombardment of particles of dispersion medium with walls of container. 

(d) Unequal bombardment of particles of dispersed phase with the dispersed medium 

30. Which of the following is true for Brownian movement? 

(a) Increases with increase in temperature 

(b) It counters the force of gravity 

(c) It is independent of wave length 

(d) All of these 

31. Which of the following is an Optical property of colloidal solution? 

(b) Brownian movement 

(a) Tyndal effect 

(c) Electrophoresis (d) Electro osmosis 

32. The property due to which the path of light becomes Visible by scattering of light by colloidal particles is called  

(a) Brownian movement 

(b) Tyndal effect 

(d) Coagulation 

(c) Electro osmosis 

33. Tyndal effect is due to – 

(a) Bombardment of colloidal particles 

(b) Scattering of light by colloidal particles 

(c) movement of colloidal particles towards light 

(d) all of these 

34. Which of the following is not due to Tyndal effect? 

(a) Twinkling of stars 

(b) Visibility of tails of comets 

(c) Calculation of Avogadro’s number 

(d) Blue colour of sky & sea water 

35. Stability of colloidal solution is due to 

(a) presence of oppositely charge 

(b) Tyndal effect 

(d) All of these. 

(c) Brownian movement 

36. Cataphoresis is due to 

(a) movement of cations

(b) movement of anions 

(c) movement of ions 

(d) movement of molecules 

37. Movement of dispersed phase & dispersion medium are respectly known as 

(a) Electro osmosis, Electro phoresis 

(b) Electro phoresis, Electro osmosis 

(c) Brownian movement, Tyndal effect 

(d) Tyndal effect, Brownian movement 

38. Zeta potential is due to 

(a) presence of cations

(b) presence of anions 

(c) presence of electrical double layer 

(d) All of these 

39. Coagulation is due to 

(a) presence of H – bond 

(b) presence of electrolyte containing oppositely charged ions to that of colloidal particles 

(C) presence of cations 

(d) presence of anions 

40. Electrolyte added for coagulation is knowns as 

(a) Coagulant 

(6) Peptising agent 

(d) None of these 

(c) Emulsifier 

41. Minimum concentration of electrolyte added for coagulation is known as 

(a) Coagulation value (b) Flocculation value 

(c) Both (a) & (b) (d) C.M.C 

42. Critical Micelle Concentration for soap solution is nearly 

(b) 103 mol 1-1 

(a) 103 mol 1-1 

(c) 104mol 1-1 

(d) 10 mol 1H 

43. Coagulating power of ions depend on 

(a) nature of charge of ions

(b) valency of ion 

(d) None of these 

(c) both (a) & (b) 

44. A mixture of colloid & crystalloid can be separated by 

(b) Cataphoresis 

(a) Diffusion 

(d) Filtration 

(c) Dialysis 

45. Which of the following can adsorb large volume of Hydrogen gas 

(b) Finely divided Ni 

(a) Finely divided Pt 

(C) Colloidal solution of Pd (d) Colloidal Fe(OH), 

46.  Which of the following is not a property of Hydrophillic sols 

(a) High conc. of dispersed phase 

(b) Coagulation is reversible 

(c) Viscosity & Surface tension are about same as for water 

(d) The charge of a particle depends on the pH value of the medium. It may be positive negetive or even zero. 

47. Which of the following will have high coagulating power for As, S, colloid ? 

(a) PO 

(b) SO2-Al3+ 

(c) Nat 

(d) e 

48. When colloidal solution is observed under ultramicroscope one can see 

(a) Light scattered by colloidal particles 

(6) Brownian movement of particles 

(c) Size of the colloidal particle 

(d) Charge of colloidal particle 

49. The zig-zag motion of colloidal particles was observed by 

(a) Zsigmondy 

(b) Ostwald 

(c) Robert Brown 

(d) Thomas Graham 

50. On adding a few drops of dil HCI to freshly prepared precipitate of Fe(OH), results a colloidal solution. The phenomenon is known as 

(a) Peptisation 

(b) Dialysis 

(c) Protective action

(d) Dissolution 

ANSWER:-

 26. (b) 27. (c) 28. (d) 29. (a)30. (d) 31. (a) 32. (b) 33. (b) 34. (c) 35.(a) 36 (c) 37. (b) 38. (c) 39. (b) 40. (a)41. (c) 42. (a) 43. (c) 44. (d) 45.(c) 46. (a) 47. (c) 48. (b) 49. (a) 50. (b)

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