InterviewSolution
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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.
| 101. |
Which of the following is not the property of hydrophilic solutions ?A. high concentration of dispersed phase can be easily obtainedB. coagulation is reversibleC. viscosity are surface tension are nearly same as that of waterD. the charge of the particles depends on the ph of the medium and it may be positive , negative or zero |
| Answer» Correct Answer - C | |
| 102. |
During micelle formation :A. `DeltaH=+ve,DeltaS=+ve`B. `DeltaH=-ve,DeltaS=-ve`C. `DeltaH=-ve,DeltaS=+ve`D. `DeltaH=+ve,DeltaS=-ve` |
| Answer» Correct Answer - A | |
| 103. |
Muddy water can be purified through coagulation usingA. common saltB. alumsC. sandD. lime |
| Answer» Correct Answer - B | |
| 104. |
CMC (Critical Micelle Concentration) isA. concentration at which micelles are destroyedB. concentration at whihc micelle formation startsC. concentration of electrolyte added to destroy the micellesD. concentraion of micelles at room temperature |
| Answer» Correct Answer - B | |
| 105. |
Above critical micelle concentration, particles get :A. associatedB. dissociatedC. both (a) and (b)D. none of these |
| Answer» Correct Answer - A | |
| 106. |
Coagulation is not done byA. persistant dialysisB. boilingC. electrophoresisD. peptisation |
| Answer» Correct Answer - D | |
| 107. |
At the critical micelle concentration, the surfactant molecules :A. decomposeB. dissociateC. associateD. become completely soluble |
| Answer» Correct Answer - C | |
| 108. |
Which of the following ions can cause coagulation of protons ?A. `Ag^(+)`B. `Na^(+)`C. `Mg^(2+)`D. `Ca^(2+)` |
| Answer» Correct Answer - A | |
| 109. |
The cause of Brownian-movement isA. temperatures fluctuations within the liquid phaseB. attraction and repulsion between charges on colloidal particlesC. impact of molecules of the dispersion medium on colloidal particlesD. convection currents |
| Answer» Correct Answer - C | |
| 110. |
Brownian movement was discovered by :A. robert brownB. zsigmondyC. hardy-schulzeD. Graham |
| Answer» Correct Answer - A | |
| 111. |
Which is used in ending charge on colloidal solution?A. electronsB. electrolysisC. positively charged ionsD. compounds |
| Answer» Correct Answer - B | |
| 112. |
A negatively charged suspension of clay in water will need for precipitation the minimum amount ofA. aluminium chlorideB. potassium sulphateC. sodium hydroxideD. hydrochloric acid |
| Answer» Correct Answer - A | |
| 113. |
colloidal solutions of gold prepared by different methods are of different colours because of :A. variable valenct of goldB. impurities produced by different methodsC. different diameters of colloidal gold particlesD. different concentration of gold particles |
| Answer» Correct Answer - C | |
| 114. |
The gold numbers of some colloidal solutions are given below : `{:("Colloidal Solution","Gold number"),(A,0.01),(B,2.5),(C,20):}` The projetive powers of these colloidal solutions follow the order :A. `cgtbgta`B. `agtbgtc`C. `a=b=c`D. `bgtagtc` |
| Answer» Correct Answer - B | |
| 115. |
The colloidal solutions of gold prepared by different methods have different colors due to :A. difference in size of colloidal particlesB. different concentration of goldC. presence of different types of foreign particlesD. the variable valency of gold |
| Answer» Correct Answer - A | |
| 116. |
When a sulphur sol is evaporated, solid sulphur is left. On mixing with water no colloidal sol is formed. The sulphur sol is :A. hydrophilicB. hydrophobicC. reversibleD. lyophilic |
| Answer» Correct Answer - B | |
| 117. |
Emulsions of polyvinyl acetate are used inA. polishesB. latex paintsC. fireworksD. rayons |
| Answer» Correct Answer - B | |
| 118. |
When white light is passed through a colloidal solution containing fine suspended particles of gold, then the scattering light seen in a direction different form that of incident light is:A. yellow colouredB. blue colouredC. green colouredD. red coloured |
| Answer» Correct Answer - D | |
| 119. |
Assertion: A quious gold colloidal solution is red in colour. Reason: The colour arises due to scattering of light by colloidal gold particles.A. statement -1 is true, statement-2 is true , statement -2 is a correctB. statement -1 is true, statement-2 is true , statement -2 is not a correctC. statement -1 is true, statement-2 is false.D. statement -1 is false, statement-2 is true. |
| Answer» Correct Answer - B | |