NCERT Class 12 Chemistry Important Short Questions & Answers for NEET

NCERT Class 12 Chemistry Short Questions & Answers 2021 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 2021

51. Which of the following is an emulsifier? 

(a)Soap 

(b) Water 

(c) Oil 

(d) NaCl 

52. Haemoglobin is an example of 

(a) Lyophilic Sol

(b) Lyophoblic Sol 

(c) Protective Sol 

(d) Coagulation of blood 

53. Which of the following is not a method for coagulation? 

(a) By heating or cooling

(b) By electrophoresis 

(c) By exposure to light

(d) By ultrafiltration 

54. Protective action of a colloid can be measured in terms of 

(b) Congo robin number 

(a) Gold Number 

(c) Both (a) & (b) (c) Micelle number 

55. Emulsifier is used to 

(a) Stabilise emulsion

 (b) Stabilise gel 

(c) Both (a) & (b)

(d) Stabilise sol 

56. Which of the following is not an oil in water emulsion? 

(b) Milk 

(a) Butter 

(c) Cod liver oil 

(d) Cold Cream 

57. The ion in potash alum acting as coagulant used for purification of drinking water is 

(a) K 

(b) AP 

(c) SO,2 

(d) All of these 

58. Aluminium hydroxide is used as a 

in dyeing. 

(a) Mordant 

(b) Chromophore 

(c) Auxochrome 

(d) Can’t be said 

59. is a surface phenomena. 

(a) Absorption 

(b) Adsorption 

(c) Both (a) & (b) 

(d) none of these 

60. Ink is soaked by a chalk due to 

(a) Absorption 

(b) Adsorption 

(C) Sorption 

(d) both (a) and (b) 

61. Which of the following is not applicable for physisorption? 

(a) It involves Vander Waal’s force 

b) It is reversible in nature 

(c) It forms mono-molecular layer 

(d) State of adsorbate is same as in bulk 

62. Which of the following is not applicable for chemisorption 

(a) Heat of adsorption is in the order 200-400 KJ/mol 

(b) It is not specific in nature 

(c) It occurs at high Temperature 

(d) Rate of adsorption a Pressure 

63. Which of the following statements is correct? 

(a) Higher the critical temperature, more easier is the liquification & more readily is the adsorption of gas 

(b) adsorption of gas is independent of critical temperature 

(c) Adsorption of gas is independent of pressure 

(d) The adsorption may be endothermic 

64. Milk is an example of 

(a) Oil in water emulsion 

(b) Oil in oil emulsion 

(c) Water in oil emulsion 

(d) Water in water emulsion 

65 When alum is added to clay water, coagulation takes place because 

(a) The clay particles are further subdivided 

(b) The charge carried by clay particles is neutralised 

(c)The density of water decreases 

(d) none of these 

66. Freshly prepared precipitates can be easily dispersed by shaking it with dispersion medium. The process is called 

(a) Peptisation 

(b) Electrophoresis 

(c) Dispersion 

(d) Dialysis 

67. Example of a liquid as dispersion medium in colloidal system is 

(a) Smoke 

(b) Milk 

(d) Cheese 

(c) Fog 

68. The presence of electric charge on the colloidal particle is indicated by the experiment 

(b) Electrolysis 

(a) Osmosis 

(d) Electrophoresis 

(c) Dialysis 

69. Number of phases in a colloidal system is 

(b) 2 

(a) 1 

(d) 4 

(c) 3 

70. Fog is a colloidal solution of. 

(a)Gas in Liquid (b) Liquid in Gas 

(d) Solid in Gas 

(c) Gas in solid 

71. The process of separation of colloids by passing through a semi-permeable membrane is called 

(b) Electrophoresis 

(a) Filtration 

(d) Ultrafiltration 

(c) Dialysis 

72. The movement of colloidal particles under the influence of applied electric field is called 

(b) Tyndall effect 

(a) Dialysis 

(c) Electrophoresis (d) Emulsion 

73. An example of micelle 1s 

(a) Sodium sterate

(b) Gold sol 

(c) Solution of NaCI

(d) Ruby glass 

74. The average molecular mass of colloidal particles can be accurately measured by 

(b) Tyndal effect 

(a) Osmotic pressure 

(C)Brownian movement (d) Floculation value 

75. Which of the following electrolytes will be most effective in causing coagulation of a positively 

charged Fe(OH), Sol ? 

(a) K,SO, 

(b) K,[Fe(CN),] 

(c) KCI 

(d) K,C0, 

76. On addition of 1ml solution of 10% NaCl to 10 ml Gold Sol in presence of 0.0250g of starch, the 

coagulation is just prevented. Starch has Gold number 

(a) 0.025 

(b) 0.25 

(c) 2.5 

(d) 25 

77. Which of the following is an example of associated colloid ? 

(a) Protein + water 

(b) Soap +water 

(c)Rubber+ Benzene (d) As,O, + Fe(OH), 

78. Which of the following will be most effective in coagulation of Gold Sol ? 

(a) NaNO, 

(b) K[Fe(CN)²] 

(c) Na PO 

(d) MgCl, 

79. Alums purify muddy water by 

(a) Dialysis 

(b) Adsorption 

(c) Coagulation (d) Forminga true solution 

80.Which of the following is an example of associated colloid? 

(a) Starch 

(b) Sodium lauryl sulphate 

(c) Sulphur 

(d) Polythene 

81. When Kl is added to AgNO, solution, the Sol formed may be written as 

(a) Agl/ 

(b) Agl /Ag’ 

(d) Agl.KNO, 

(c) Agl NO 

82. Soap removes grease by 

(a) Adsorption 

(b) Emulsification 

(c) Coagulation 

(d) None of these 

83. Which of the following reaction gives a colloidal solution? 

(a) MgCO, > MgO+CO, 

(b) 2Na +2H,02NaOH + H, 

(C) 2HNO, +3H,S3S + 4H,0+ 2NO 

(d) Cu+ CuCl, Cu,C1, 

84 The As²S³, solution is charged due to the adsorption of_________________ion. 

(a) S²- 

(b) OH- 

(d) As3+ 

(c) H+ 

85. The method commonly employed for the destruction of a colloidal solution is 

(a) Addition of an electrolyte 

(b) Diffusion through animal membrane 

(c) Condensation (d) Dialysis 

 86. Which of the following is not correct regarding the adsorption of a gas on the surface of a solid? 

(a) On increasing temperature adsorption increases continuously 

(b) Enthalpy & entropy changes are negative 

(c) Adsorption is more for specific substance 

(d) It is a reversible reaction. 

of charged particles on 

87. Peptisation is due to a surface. 

(a) absorption 

(b) adsorption 

(c) coagulation 

(d) condensation 

88. Which is an emulsion? 

(a) Boot polish 

(b) Lipstick 

(c) Shampoo 

(d) all of these 

89. The size of colloidal particles is 

(a) less than true solution particles 

(b) less than suspension particles 

(c) greater than suspension particles 

(d) none of these 

90. Which is not a colloid? 

(a) Egg white 

(b) milk 

(c) Ruby glass 

(d) FeCl 

91. Solvent hating colloids are 

(a) lyophobic 

(b) lyophilic 

(c) hydrophilic 

(d) none of these 

92. Tails of comets are visible due to 

(a) Tyndal effect 

(b) Brownian movement 

(c) reflection 

(d) all of these 

93. Foam is a colloidal solution of 

(a) gaseous particles dispersed in gas 

(6) gaseous particles dispersed in a liquid 

(c) solid particles dispersed in a liquid 

(d) solid particles dispersed in a gas 

94. Medicines are more effective if they are used in 

(a) colloidal state 

(b) solid state 

(c) solution state 

(d) cannot be predicted 

95. Brownian movement of particles is the property of colloidal solutions. 

(a) optical 

(b) electrical 

(c) mechanical  

(d) none of these 

ANSWER:-

51. (d) 52. (c) 53. (b) 54. (a) 55. (c) 56. (a) 57. (c) 58. (c) 59.(b) 60. (c) 61. (a) 62. (a) 63. (a) 64. (a) 65. (b) 66. (a) 67. (b) 68. (d) 69. (b) 70. (b) 71. (c) 72. (c) 73. (a) 74. (a) 75. (b) 76. (d) 77. (b) 78. (d) 79. (c)80. (b)81. (b) 82. (b) 83. (c) 84. (a) 85. (a) 86. (a) 87. (b) 88. (d) 89. (b) 90. (d) 91. (a) 92. (a) 93. (b) 94. (a) 95. (c) 

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