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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Emulsions are also called the colloidal solutions in which the disperse phase as well as dispersion medium are liquids. It may be oil-in-water or water-in-oil type Emulsifiers can be used to stabilize the emulsion. Soaps, detergents, proteins, and gums are used as emulsifiers. Addition of lyophilic solution to the emulsion formsA. a protective film around the dispersed phaseB. a protective film around the dispersion mediumC. an aerosolD. true solution |
| Answer» Correct Answer - A | |
| 52. |
There are certain substances which behave as normal, strong electrolyte at low concentration but at higher concentration they behave as colloidal solutions due to the formation of aggregated particles. Such colloids called associated colloids and the aggregated particles are called micelles. The formation of micelles take place above certain concentration called critical micellization concentration (CMC) and a characteristic temperature. Micelles are used inA. detergentsB. magnetic separationC. petroleum recoveryD. all of these |
| Answer» Correct Answer - A,C | |
| 53. |
The substances involved in micellization are :A. polyphilic in natureB. non-polar in natureC. diphilic in natureD. uniphilic in nature |
| Answer» Correct Answer - C | |
| 54. |
Sedimentation potential is reverse of :A. electro-osmosisB. electrophoresisC. electrokinetic potentialD. streaming potential |
| Answer» Correct Answer - B | |
| 55. |
which of the following are lyophilic in nature ?A. gumB. sulphurC. starchD. protein |
| Answer» Correct Answer - A,C,D | |
| 56. |
A lyophilic sol is at its isoelectric point then it is :A. negatively chargedB. positively chargeC. not chargedD. none of these |
| Answer» Correct Answer - C | |
| 57. |
Which of the following is not a colloidal systems ?A. breadB. muddy waterC. concreteD. sugar in water |
| Answer» Correct Answer - D | |
| 58. |
Peptization denotes :A. digestion of foodB. hydrolysis of proteinsC. breaking and dispersion into colloidal stateD. precipitation of solid from colloidal dimension |
| Answer» Correct Answer - C | |
| 59. |
Peptization of `SnO_2` by NaOH gives :A. `[SnO_2]SnO_(3)^(2-):2Na^+`B. `[SnO_2]SnO^(4+):O^(2-)`C. `[SnO_2]Na^(+):OH^(-)`D. `[SnO_2]Sn^(4+):OH^(-)` |
| Answer» Correct Answer - A | |
| 60. |
The coagulating power of electrolytes having inos `Na^(o+),Al^(3+)` and `Ba^(2+)` for arsenic sulphide sol increases in the orderA. `Ba^(2+)ltNa^(+)ltAl^(3+)`B. `Al^(3+)ltNa^(+)ltBa^(2+)`C. `Al^(3+)ltBa^(2+)ltNa^(+)`D. `Na^(+)ltBa^(2+)ltAl^(3+)` |
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Answer» Correct Answer - D Arsenic sulphate is negative sol hence, greter is the positive charge of cation, more will be its coagulating power. `overset(Na^(+)ltBa^(2+)ltAl^(3+))underset("Increasing coagulation power ")to` |
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| 61. |
Which of the following is an anionic detergent ?A. sodium sterateB. sodium lauryl sulphateC. ceyltrimethyl ammonium bromideD. glyceryl oleate |
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Answer» Correct Answer - B Sodium lauryl sulphate is an anionic detergent. Its molecular formula is : `CH_3-(CH_2)_11SO_4^(-)Na^(+)` |
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| 62. |
An example of solid -solid system is :A. smokeB. cokeC. synthetic gemsD. pumice stone |
| Answer» Correct Answer - C | |
| 63. |
Which of the following are examples of aerosols ?A. Whipped creamB. CloudC. fogD. soap lather |
| Answer» Correct Answer - B,C | |
| 64. |
The coagulation of `100mL` of a colloidal solution of gold is completely prevented by adding `0.25g` of starch to it before adding `10mL` of `10%NaCl` solution. The gold number of starch is |
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Answer» Correct Answer - B [10 ml of `10%` NaCI solution is added to 100 ml of solution of gold. thus, 1 ml of 10% NaCI solution has been added to 10 ml solution of gold. Since, 100 ml gold solution required `=0.25g` starch `=0.25xx10^(3)` mg starch so, 10 ml gold solution required `=(0.25xx10^(3))/(100)xx10` Thus, by definition, the gold number of starch is `25`.] |
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| 65. |
Which of the following substance gives a positively charged sol?A. GoldB. aresenius sulphideC. starchD. ferric hydroxide |
| Answer» Correct Answer - D | |
| 66. |
In brownian motion , the paths of the particles are :A. linearB. zig-zagC. uncertainD. curved |
| Answer» Correct Answer - B | |
| 67. |
The movement of dispoerison medium in an electric field when the dispersed particles are prevented form moving is called .A. cataphoresisB. electrophoresisC. electro-osmosisD. brownian movement |
| Answer» Correct Answer - C | |
| 68. |
Isoelectirc point is the pH at which colloidal particles.A. coagulateB. become electrically neutralC. can move toward either eletrodeD. none of the above |
| Answer» Correct Answer - A,B,C | |
| 69. |
Mehtods used for the preparation of colloidal solutions are :A. peptizationB. hydrolysisC. ultrasonic dispersionD. coagulation |
| Answer» Correct Answer - A,B,C | |
| 70. |
Which one of the following is correctly matched?A. emulsion-smokeB. gel-butterC. sol-whipped creamD. aerosol- hair cream |
| Answer» Correct Answer - B | |
| 71. |
Which of the following reactions is not used for the preparation of a colloidal solutions ?A. `2AuCI_3+3SNCI_2to3SnCI_4+2Au`B. `FeCI_3+3H_2OtoFe(OH)_3+3HCI`C. 2 Mg+CO_2 to 2 MgO +C`D. `2H_2S+SO_2to 2H_2Oto2H_2O+3S` |
| Answer» Correct Answer - C | |
| 72. |
Continous phase contains dispersed phase throughout Example isA. water in milkB. fat in milkC. water in milkD. oil in water |
| Answer» Correct Answer - A | |
| 73. |
Peptization denotes:A. digestion of foodB. hydrolysis of proteinsC. breaking and dispersion into colloidal stateD. precipitation of solid from colloidal state |
| Answer» Correct Answer - C | |
| 74. |
When freshly precipitated `Fe(OH)_(3)` is boiled with water in the presence of few drops of dil. HCI, a hydrated ferrric oxide sol is obtained. This method termed :A. dialysisB. peptizationC. ultrafiltrationD. electro-dispersion |
| Answer» Correct Answer - B | |
| 75. |
Sulphur sol continsA. discrete sulphur atomsB. discrete sulphur moleculesC. water dispersed in solid sulphurD. large aggregates of sulphur molecules |
| Answer» Correct Answer - D | |
| 76. |
Cod liver oil isA. fat dispersed in waterB. water dispersed in fatC. water dispersed in waterD. fat dispersed in fat |
| Answer» Correct Answer - C | |
| 77. |
Sulphur sol contains :A. discrete s-atomsB. discrete s-moleculesC. large aggrements of s-moleculesD. water dispersed in solid sulphur |
| Answer» Correct Answer - C | |
| 78. |
when NaCI solution is added to `Fe(OH)_3` sol then :A. `[Fe(OH)_3]Fe^(3+)` is formedB. `[Fe(OH)_3]CI^(_)` is formedC. `[Fe(OH)_3]` is coagulatedD. `[Fe(OH)_3]Na^(+)` is formed |
| Answer» Correct Answer - C | |
| 79. |
1 mole of `Agl//Ag^+` sol. Is coagulated by :A. 1 mole of KIB. `500 ml` of `1 M K_2SO_4`C. `300 ml` of `1m Na_3PO_3`D. 1 mole of Agl |
| Answer» Correct Answer - A | |
| 80. |
Colloidal solution commonly used in treatment of eye disseae is :A. colloidal sulphurB. colloidal antimonyC. colloidal silverD. colloidal gold |
| Answer» Correct Answer - C | |
| 81. |
The potential differnce between the fixed particles layer and the diffused layer having opposite charge id called :A. Zeta potentialB. colloidal potentialC. dorn potentialD. streaming potential |
| Answer» Correct Answer - A | |
| 82. |
colloidal silver iodies is prepared by adding silver nitrate in slight excess to potassium iodide solution. When subjected to an electric field, the colloidal particles, migrate to the anode. (R) Colloidal particles absorb ions thus become electrically charged.A. IF both (A) and (r) are correct and (r) is the correct explanation for (a).B. If both (a) and (r) are correct but (r) is not the correct explanation for (a).C. IF (a) is correct but (r) is incorrect.D. If (a) is incorrect but (r) is correct. |
| Answer» Correct Answer - D | |
| 83. |
The number of phases in colloidal system areA. 2B. 4C. 3D. 1 |
| Answer» Correct Answer - A | |
| 84. |
The size of a colloidal particle is :A. `gt0.1mu`B. `1mu` to `0.1mu`C. `lt0.1mmu`D. more than 3000 m `mu` |
| Answer» Correct Answer - B | |
| 85. |
Substances whose solutions can readily through animal membrane are called :A. colloidasB. crystalloidsC. electrolytesD. non-electrolytes |
| Answer» Correct Answer - B | |
| 86. |
Which of the following is an emulsifier ?A. oilB. soapC. solventD. KCI |
| Answer» Correct Answer - B | |
| 87. |
An emulsifier is an agenet whichA. stablizes the emulsionB. coagulation the emulsionC. retards the dispersion of liquid in liquidsD. homogenises the emulsion |
| Answer» Correct Answer - A | |
| 88. |
Which one of the following colloidal solutions is postive sol ?A. bloodB. clay oilC. smokeD. gelatin in strongly acidic solution. |
| Answer» Correct Answer - D | |
| 89. |
Which one of the following is a false statement?A. cell fluid is an example of solB. butter is an example of gel C. hair cream is an example of foamD. cheese is an example of emulsion. |
| Answer» Correct Answer - D | |
| 90. |
Which one of the following is a false statement?A. cell fluid is an example of solB. butter is an example of gelC. hair cream is an example of foamD. cheese is an example of emulsion. |
| Answer» Correct Answer - D | |
| 91. |
Gold number is associated withA. electrophoresisB. purple of cassiusC. protective colloidD. amount of pure gold |
| Answer» Correct Answer - C | |
| 92. |
Gold number was given by :A. ostwaldB. zsigmondyC. william and changD. langmuir |
| Answer» Correct Answer - B | |
| 93. |
(a) Colloidal sol of `Fe(OH)_3` formed by peptization carries positive chrage. (r) During the formation of positively charged colloidal particles of `Fe(OH)_3` the electons are lost by the colloidal particles of `Fe(OH)_3`.A. IF both (A) and (r) are correct and (r) is the correct explanation for (a).B. If both (a) and (r) are correct but (r) is not the correct explanation for (a).C. IF (a) is correct but (r) is incorrect.D. If (a) is incorrect but (r) is correct. |
| Answer» Correct Answer - C | |
| 94. |
The electrolyte which has the least effect in the coagulation of `Fe(OH)_3` sol isA. potassium carbonateB. sodium sulphateC. potassium ferrocyanideD. potassium iodide |
| Answer» Correct Answer - C | |
| 95. |
Suspensions are :A. visible to naked eyeB. invisible through microscopeC. not visible by any meansD. invisible under electron microscope |
| Answer» Correct Answer - A | |
| 96. |
The size of the colloidal particles is in between :A. `10^-7-10^(-9)cm`B. `10^-9-10^(-11)cm`C. `10^-5-10^(-7)cm`D. `10^-2-10^(-3)cm` |
| Answer» Correct Answer - C | |
| 97. |
Silver iodide is used for producing artificial rains because Agl:A. is easy to spray at high altitudeB. is insoluble in waterC. is east to synthesizeD. has crystals similar to ice |
| Answer» Correct Answer - A | |
| 98. |
All colloidal solutions show :A. very high osmotic pressureB. high osmotic pressureC. low osmotic pressureD. no osmotic pressure |
| Answer» Correct Answer - C | |
| 99. |
The colligative property of a colloidal sol compared to the solution of non-electrolyte of same cancentration will beA. sameB. higherC. lowerD. higher or lower |
| Answer» Correct Answer - C | |
| 100. |
Colloidation is a colloidal solution of :A. sucrose in waterB. cellulose in waterC. cellulose nitrate in waterD. cellulose nitrate in ethyl alcohol |
| Answer» Correct Answer - C | |