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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.
| 1001. |
Gold sol is not sA. Lyophobic solB. Negatively charged solC. Macromolecular solD. Multimolecular sol. |
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Answer» Correct Answer - C Gold is not a macromolecular sol. |
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| 1002. |
For Freundlich isotherm, a groph of log x/m is plotted against log p.A. 1/n, kB. log 1/n, kC. 1/n log kD. log 1/n, log k |
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Answer» Correct Answer - C Freundlich adsorption isotherm is written as : `logx//underset(("Intercept"))(logK)+underset(("Slope"))(1//n logP)` |
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| 1003. |
Butter is a colloid formed when :A. A gelB. AnemulsionC. A solD. Not a colloid |
| Answer» Correct Answer - A | |
| 1004. |
The number of phase present in colloidal solution is :-A. 2B. 4C. 3D. 1 |
| Answer» Correct Answer - A | |
| 1005. |
Lyophobic colloids are :-A. ReversibleB. IrreversibleC. Water lovingD. Solvent loving |
| Answer» Correct Answer - B | |
| 1006. |
Storng Tyndall effect is observed only when (i) the refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude (ii) the diameter of the dispersed particles is biggest than the wavelength of the light used (iii) the refractive indices of the dispersed phase and the dispersion medium are similar (iv) the diameter of the dispersed particles is not much smaller than the wavelength of the light used.A. 1 and 4B. 2 and 4C. 1 and 3D. 2 and 3 |
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Answer» Correct Answer - B |
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| 1007. |
Which one of the following is not applicable to the phenomenon of adsorption?A. `Delta H gt 0`B. `Delta G lt 0`C. `Delta S lt 0 `D. `Delta H lt 0` |
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Answer» Correct Answer - A For phenomenon of adsorption `Delta H lt 0` i.e., enthalpy change during phenomenon of adsorption is negative because during adsorption, there is always a decrease in residual forces of the surface which lead to decrease in surface energy which appears as heat. So, adsorption is an exothermic process and `Delta H lt 0`. |
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| 1008. |
Physical adsorption of a gaseous species may change to chemical adsorption with ……. .A. decrease in temperatureB. increase in temperatureC. increase in surface area of adsorbentD. decrease in surface area of adsorbent |
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Answer» Correct Answer - B On increasing temperature physisorption changes to chemisorption. As temperature increase , energy of activation of adsorbate particles increases which lead to Hence , physisorption transform into chemisorption. |
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| 1009. |
Which one is wrongly match?A. Micelles - Associated colloidsB. Lyophilic colloids- Reversible solutionC. Cheese - SolD. ZSM - 5 - shape selective catalyst |
| Answer» Correct Answer - C | |
| 1010. |
Hair cream is :-A. gelB. emulsionC. solid solD. sol |
| Answer» Correct Answer - B | |
| 1011. |
According to Hardy schultz law, the floculating power of an ion increases with :-A. Decreases in sizeB. Increase in sizeC. Decrease in chargeD. Increase in charge |
| Answer» Correct Answer - D | |
| 1012. |
When an excess and a very dilute aqueous solution of KI is added to a very dilute aqueous solutions of silver nitrate, the colloidal particles of silver iodide which are associated with the Helmholtz double layer:-A. `AgIvdotsAg^(+)vdotsI^(-)`B. `AgIvdotsK^(+)vdotsNO_(3)^(-)`C. `AgIvdotsNO_(3)^(-)vdotsAg^(+)`D. `AGIvdotsI^(-)vdotsK^(+)` |
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Answer» Correct Answer - A When KI solution is added to `AgNO_(3)` solution, positively charged sol results due to adsorption of `Ag^(+)` from dispersion medium forming `AgI//Ag^(+)` acquired a positive charge. This layer attracts counter ions from the medium forming a second layer as `AgI//Ag^(+)//I^(-)`. |
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| 1013. |
Which one of the following is not a colloidal solution?A. SmokeB. InkC. AirD. Bloood |
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Answer» Correct Answer - C Air is not a colloidal solution because it is a homogeneous mixture. |
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| 1014. |
The process of separation of colloids by passing through semi permeable membrane is calledA. FiltrationB. ElectrophoresisC. DialysisD. Ultrafiltration |
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Answer» Correct Answer - C Dialysis `rarr` Dialysis if separation of colloids by passing through semi permeable membrane. |
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| 1015. |
The stabilization of a dispersed phase in a lyophobic colloide sol is due toA. The adsorption of charged substance on dispersed phaseB. The large electrokinetic potential developed in the colloidC. The viscosity of the mediumD. the formation of an electrical layer between two phases. |
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Answer» Correct Answer - D There is adsorption of common ion on the colloidal sol and an electrical double layer is formed. Thus, dispersed phase in a lyophobic colloidal sol is stabilized. `underset("Fixed part")[Fe(OH)_(3)]FR^(3+) vdotsunderset("Mobile part")(3 C I^(-))`. |
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| 1016. |
A liquid aerosol is a colloidal system foA. A liquid dispersed in a solidB. A liquid dispersed in a liquidC. A gas dispersed in a liquidD. A solid dispersed in a gas |
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Answer» Correct Answer - B Liquid aerosol involves liquid dispersed in gas, e.g, cloud, fog, mist, etc. |
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| 1017. |
What are lyophilic and lyophobic sols ? Give one example for each type. |
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Answer» Lyophilic colloid : The colloidal solution in which the dispersed phase has great affinity to the dispersion medium is called a Lyophilic colloid or Lyophilic solution. Ex : Starch solution. The starch paste when dissolved in hot water, with stirring, the starch solution is formed. The starch particles (dispersed phase) has great affinity to water molecules (dispersion medium). So starch solution is a lyophilic solution or lyophilic colloid. Lyophobic colloid : The colloidal solution in which there exists not much affinity between the dispersed phase and dispersion medium, it is called a Lyophobic colloid or Lyophobic solution. Ex : Gold solution. Gold rods are placed in water containing alkali. Electric arc is applied between gold rods. The gold particles dissolves in water, to give gold solution. Gold particles (dispersed phase) have not much affinity towards water (dispersion medium). So this is a Lyophobic solution or Lyophobic colloid. |
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| 1018. |
Explain the terms aerosol with suitable examples. |
| Answer» Aerosol: The colloidal solution in which dispersed phase is solid and dispersion medium is gas is called an aerosol. Eg : Smoke, dust. | |
| 1019. |
Why is it important to have clean surface in surface studies ? |
| Answer» It facilitates the adsorption of desired species . If surface is covered by the gases of air then it will not be available for adsorption of desired gases. So, it is very important to have clean surface in surface studies i.e. , study of surface chemistry. | |
| 1020. |
Why chemisorption is called activated adsorption ? |
| Answer» Chemisorption involves a high energy of activation. Hence it is referred as activated adsorption. | |
| 1021. |
In the case of chemisorption, why adsorption first increases and then decreases with temperature? |
| Answer» The initial increases is due to the fact that the heat supplied acts as an activation energy. The decrease afterwards is due to the exothermic nature of adsorption equilibrium. The initial increases is due to the fact that the heat supplied acts as an activation energy. The decrease afterwards is due to the exothermic nature of adsorption equilibrium. | |
| 1022. |
Yhe rate of chemisorption a. increaeses with decreases in temperature b. increases with increasesin tempreture c. increases with decreases in the pressure of gas d. is independent of the pressure of gas |
| Answer» Chemisorption involves high activation energy and increases to a maximum value with rise in temperature. Chemisorption involves high activation energy and increases to a maximum value with rise in temperature. | |
| 1023. |
Assertion : A sol of `As_(2)S_(3)` prepared by the action of `H_(2)S on As_(2)O_(3)` is negatively charged. Reason : It is due to the adsorption of `H^(+)` ions on the surface of the colloidal particles and `S^(2-)` ions on the diffused layer.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason both are incorrect. |
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Answer» Correct Answer - C Correct reason. It is due to the adsorption of the `S^(2-)` ions on the surface of the colloidal particles and `H^(+)` ions in the diffused layer. |
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| 1024. |
The stability of the dispersed phases in a lyophobic colloides is due toA. high viscosity of the mediumB. The formation of electrical layer between two phasesC. High surface tension of solD. none of these |
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Answer» Correct Answer - B Factual |
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| 1025. |
Gelatian is mostly used in making ice cream in order toA. prevent making of colloidB. To stabilise to colloid and prevent crystallisationC. To stabilise mixtureD. to enrich the aroma |
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Answer» Correct Answer - B Gelatin is a protective colloid. |
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| 1026. |
In which of the following Tyndall effect is not observedA. SuspensionsB. emulsionC. Sugar solutionD. Gold sol. |
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Answer» Correct Answer - C True solution does not show Tyndall effect like sugar solution. |
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| 1027. |
The Brownian motion is due to :A. Temperature fluctuation within the liquid phaseB. Attraction and repulsion between charge on the colloidal particlesC. Impact of molecules of the dispersion medium on the colloidal particlesD. All of these |
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Answer» Correct Answer - C Brownian motion is due to impact of molecules of the dispersion medium on the colloidal particles. |
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| 1028. |
Sky looks blue due toA. Dispersion effectB. ReflectionC. TransmissionD. Scattering |
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Answer» Correct Answer - D Sky looks blue due to scattering of light by dust particles present in the atmosphere. |
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| 1029. |
Sky looks blue due toA. dispersionB. reflectionC. transmissionD. scattering |
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Answer» Correct Answer - D |
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| 1030. |
The emulsoid which is added to suspensoid to prevent flocculation is called……………….. |
| Answer» Correct Answer - Protective colloid | |
| 1031. |
What is protective colloid ? |
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Answer» Lyophilic colloids used for the prevention of coagulation of lyophobic colloids are called protective colloids. `to` Lyophilic colloids protect the lyophobic colloids. |
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| 1032. |
Which of the following has minimum gold number ?A. GelatinB. StarchC. AlbuminD. Blood |
| Answer» Correct Answer - A | |
| 1033. |
Gold number is minimum in case of……………A. GelatinB. egg albuminC. gumarabicD. starch |
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Answer» Correct Answer - A |
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| 1034. |
Gold sol is an electronegative sol. The amount of electrolyte required to coagulate a certain amount of gold sol is maximum in this case ofA. `CaCl_(2)`B. `NaCl`C. `AlCl_(3)`D. `Na_(2)SO_(4)` |
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Answer» Correct Answer - C Coagulation is governed by Hardy schulze rule. |
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| 1035. |
The surface tension of which of the following liquid is maximumA. `H_(2)O`B. `C_(6)H_(6)`C. `CH_(3)OH`D. `C_(2)H_(5)OH` |
| Answer» Correct Answer - A | |
| 1036. |
Gold number isA. The number of mg of lyophilic colloid which should be added to 10 ml of ferric hydroxide sol so as to prevent its coagulation by the addition of 1 ml of 10% sodium chloride solutionB. The number of mg of lyophilic colloid which should be added to 10 ml of standard gold sol so as to prevent its coagulation by the addition of 1 ml of 10% NaClC. The mg of gold salt to be added to a lyophilic colloid to coagulate itD. The mg of gold salt to be added to a lyophilic colloid |
| Answer» Correct Answer - B | |
| 1037. |
Light scattering takes place inA. Solutions of electrolyteB. Colloidal solutionC. ElectrodialysisD. Electroplating |
| Answer» Correct Answer - B | |
| 1038. |
Which of the following pair (s) of ions would be expected to form precipitate when dilute solutions are mixed?A. `Na^(+),SO_(3)^(2-)`B. `NH_(4)^(+),CO_(3)^(2-)`C. `Na^(+),S^(-2) `D. `Fe^(+3),PO_(4)^(-3)` |
| Answer» Correct Answer - D | |
| 1039. |
Assertion: For arsenic sulphide sol, `BaCl_(2)` has higher coagulation value than `NaCl` Reason : Higher the valency of the oppoistively charged ion of the electrolyte added, higher is the coagulating power of the electrolyte.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - D Correct assertion: For negatively charged `As_(2)S_(3)` sol, `BaCl_(2)` has lower coagulation value (or higher coagulation power) than `NaCl`. |
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| 1040. |
When `9.0ml` of arsenius sulphide sol and `1.0ml` of `1.0xx10^(-4)M BaCl_(2)` are mixed turbidity due to precipitation just appears after 2 hours. The effective ion and its coagulating value are respectively.A. `Cl^(-),10"m mol"//L`B. `Cl^(-),20"m mol"//L`C. `Ba^(2+),10"m mol"//L`D. `Ba^(2+),20"m mol"//L` |
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Answer» Correct Answer - 3 Conc. Of `Ba^(2+)=(10^(-4))/(10xx10^(-3))M=10^(-2)M=10"m mole"//L` |
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| 1041. |
The `pH` value of the solution in which a particular amino acid does not migrate under the influence of electric field is called the:A. Neutralisation pointB. End pointC. lsoelectric pointD. All of these |
| Answer» Correct Answer - C | |
| 1042. |
An emulsifier is an agenet whichA. Accelerates the dispersionB. Homogenizes an emulsionC. Stabilizes an emulsionD. Aids the flocculation of an emulsion |
| Answer» Correct Answer - B | |
| 1043. |
Smoke is a colloidal sol ofA. Gas dispersed in a solidB. solid dispersed in a gasC. solid dispersed in a liquidD. gas dispersed in a liquid |
| Answer» Correct Answer - B | |
| 1044. |
Which of the following is correct ?A. Argyrol is a silver sol used as an eye lotionB. Colloidal antimony is used in curing KalaazarC. Colloidal gold is used for intramuscular injectionD. All of these |
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Answer» Correct Answer - D Most of the medicines are colloidal medicines are more effective as they have large surface area and hence are easily assimilated. |
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| 1045. |
Which of the following is not a correct statement?A. The deltas at the mouths of great rivers are formed by the precipitation of the charged, carriedas suspension in the river water, by the action of salts present in sea water.B. Bleeding due to a cut can be stopped by applying ferric chloride solution due to coagulation of positively charged blood particles by `Cl^(-)` ions.C. Gelatin is added to ice cream as a protective agent so as to preserve its smoothness.D. The chrome-tanning of leather is brought about by the penetration of positively charged particles of hydrated chromic oxide into the leather. |
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Answer» Correct Answer - B The styptic action of ferric chloride is due to coagulation of negatively charged blood particles by `Fe^(3+)` ions. |
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| 1046. |
Latex is a colloidal solution of rubber particles which areA. negatively chargedB. positively chargedC. neutralD. zwitter ions |
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Answer» Correct Answer - A Latex is a milky fluid produced by certain plants. The most important is that obtained form the rubber tree (Hevea brasiliensis) consisting mainly of a colloidal suspension of rubber globules in a watery liquid. |
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| 1047. |
A small amount of silica gel and anhydrous calcium chloride are placed separately in two coeners of a vessel containng water vapour. What phenomena will occur? |
| Answer» Adsorption of water will occur on silica gel and adsorption of water will occur on calcium chloride. Adsorption of water will occur on silica gel and adsorption of water will occur on calcium chloride. | |
| 1048. |
A small amount of silica gel and a small amount of anhydrous calcium chloride are placed seperately in two corners of a vessel containing water vapour. What phenomena will occur ? |
| Answer» A small amount of silica gel and a small amount of anhydrous `CaCl_(2)` are placed separately in two corners of a vessel of water vapour . Water vapours are is absorbed by anhydrous `CaCl_(2)` but absorbed by silical gel. | |
| 1049. |
Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II.`{:("column-I","column-II"),("(A) milk","(P) Aerosol "),("(B) Dust",(Q) " Emuslion"),("(C) Cheese","(R) Gel "),("(D)Froth ","(S) from "):}` |
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Answer» Correct Answer - `A to Q ; B to P ; C to R ; D to S` |
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| 1050. |
Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. `{:("column-I","column-II"),((A)" Chemisorption",(P)" Exothermic"),((B)" Physical adsorption",(Q)" Endoothermic"),((C)" Desorption",(R)" Removal of adsorbed material"),((D)" Activation of adsorbent",(S)" Highly specific in nature"):}` |
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Answer» Correct Answer - `Ato P,S; Bto P; C to Q,R; D to Q` |
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