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.
| 1. |
When dispersed phase is liquid and dispersion medium is gas, then the colloidal system is calledA. smokeB. emulsionC. coludD. gel |
| Answer» Correct Answer - C | |
| 2. |
Assertion : Colloidal solutions are electrically netural Reason : Dispersed phase and dispersion medium carry same change.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 - C | |
| 3. |
Lysione in not used as :A. disinfectantB. germ killerC. treating eye diseaseD. anti- cancer drug |
| Answer» Correct Answer - B,C,D | |
| 4. |
The blue colour of the water of the sea is due to :A. reflection of blue light by salts present in waterB. scattering of blue light by sol particlesC. reflection of blue coloured light by the impurities present in sea waterD. absorption of radiation of different colours expect blue light. |
| Answer» Correct Answer - B | |
| 5. |
Bleeding is stopped by the application of ferric-chloride this is because:A. the blood starts flowing in opposite directionB. the ferric chloride seals the blood vesselC. the blood reacts and forms a solid which seals the blood vesselD. the blood is coagulated and thus, the blood vessel seals is sealed |
| Answer» Correct Answer - D | |
| 6. |
Statement : to stop bleeding from an injury ferric chloride can be applied.A. it is not true , ferric chloride is a poison.B. it it true `Fe^(3+)` ions coagulate blood which is negatively charged byC. it is not true ,`CI^(-)` ions form postively charged sol, profuse bleeding takes place.D. it is not true, ferric chloride is ionic and gets into blood stream. |
| Answer» Correct Answer - B | |
| 7. |
The process of separation of cream form milk is called :A. emulsificationB. dmulsificationC. electro-osmosisD. peptization |
| Answer» Correct Answer - B | |
| 8. |
The emulsifying agent in milk isA. lactic acidB. fatC. lactoseD. casein |
| Answer» Correct Answer - D | |
| 9. |
Which of the following forms cationic micelles above certain concentration ?A. sodium dodecyl sulphateB. sodium acetateC. ureaD. cetyltrimethyl ammonium bromide |
| Answer» Correct Answer - D | |
| 10. |
Which of the following has minimum flocculation value ?A. `Pb^(2+)`B. `Pb^(4+)`C. `Sr^(2+)`D. `Na^(+)` |
| Answer» Correct Answer - B | |
| 11. |
The smog is essentially caused by the presence of `:`A. `O_2` and `O_3`B. `O_2` and `N_2`C. oxides of sulphur and nitrogenD. `O_3` and `N_2` |
| Answer» Correct Answer - C | |
| 12. |
The negative charge on ` As_2S_3` sol is due to adsorption of :A. `H^(+)`B. `OH^(-)`C. `O^(2-)`D. `S^(2-)` |
| Answer» Correct Answer - D | |
| 13. |
`Fe^(3+)` can be used for coagulation of `As_2S_3` sol. (R) `Fe^(3+)` reacts with `As_2 s_3` to give `Fe_2S_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 | |
| 14. |
Which one of the following is most effective in causing the coagulation of an `As_2S_3` sol ?A. KCIB. `AlCI_3`C. `MgSO_4`D. `K_3[Fe(CN)_6]` |
| Answer» Correct Answer - B | |
| 15. |
(a) True solutions do not exhibit tyndall effect. (r) in true solutions, size of solute particles is much smaller than the wavelength of light used.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 - A | |
| 16. |
Tyndall effect in colloidal solution is due toA. absorption of lightB. scattering of ilghtC. reflection of lightD. presence of electrically charged particles |
| Answer» Correct Answer - B | |
| 17. |
Tyndall effect in shown by :A. precipitateB. solC. plasmaD. solution |
| Answer» Correct Answer - B | |
| 18. |
When `H_2S` gas in passed through nitric acid, the product is :A. rhomic sulphurB. primatic sulphurC. amorphous sulphurD. monoclinic sulphur |
| Answer» Correct Answer - C | |
| 19. |
the solution of natural rubber in benzene is an example of :A. lyophobic acidB. glucoseC. stearic acidD. glycine |
| Answer» Correct Answer - B | |
| 20. |
which of the following shows the maximum hydrophobic begaviour ?A. adenineB. glucoseC. stearic acidD. glycine |
| Answer» Correct Answer - A | |
| 21. |
Which of the following properties are characteristic of lyophobic sols ? 1. low viscosity, 2.high viscosity , 3. reversibility and 4. coagulation by electrolytes at low concentration Select the correct answer using the codes given below:A. 2,3 and 4B. 2and 3 onlyC. 1 and 4 onlyD. 1 and 3 only |
| Answer» Correct Answer - C | |
| 22. |
Oils and fats are obtained by saponification potassium steatrate. Its formula is `CH_3-(CH_2)_(16)-COO-K_(+)`. Lyophobic end of atom is `(CH_3)` and lyophilic end is `COO-K^(+)`. Potassium stearate is example ofA. lyophobic colloidB. lyophilic colloidC. multimolecular colloidD. associated colloid or micelle |
| Answer» Correct Answer - D | |
| 23. |
The coagulation of 200 ml of a positive colloid took place when 0.73g HCI was added to it. The floculation value of HCI for the colloid is :A. 150B. 200C. 100D. 36.5 |
|
Answer» Correct Answer - C number of moles of hci added `=(0.73)/(36.5)=0.02mol =20m" "mol` Then number of millimoles required by 1000ml sol `=(20)/(200)xx100m mol`. |
|
| 24. |
`Fe^(3+)` ions coagulate blood. This show should blood contains colloidal particles bearing.A. negative chargeB. positive chargeC. no chargeD. either positive or negative charge |
| Answer» Correct Answer - A | |
| 25. |
Gold number is a measure ofA. stability of colloidal systemB. coagulating power of a colloidC. size of colloidal particlesD. efficiency of the protective colloid |
| Answer» Correct Answer - D | |
| 26. |
Gold number is a measure ofA. the amount of gold present in the colloidal solutionB. the amount of gold required to break the colloidC. the amount of gold required to protect the colloidD. none of the above |
| Answer» Correct Answer - D | |
| 27. |
surface tension of lyophilic sols isA. lower than that `H_2O`B. equal to that of `H_2O`C. more than that of `H_2O`D. none of these |
| Answer» Correct Answer - A | |
| 28. |
Surface of lyophilic sols isA. equal to that of solventB. less than that of solventC. more than that of solventD. can not be predicted |
| Answer» Correct Answer - B | |
| 29. |
surface tension of lyophilic sols isA. lower than `H_2O`B. more than `H_2O`C. equal to `H_2O`D. none of these |
| Answer» Correct Answer - A | |
| 30. |
An example of micelle isA. `As_2O_3` sol.B. ruby glassC. `Na_2CO_3` solutionD. sodium stearate concentrated solution |
| Answer» Correct Answer - D | |
| 31. |
The potential differnce between the fixed particles layer and the diffused layer having opposite charge id called :A. colloidal potentialB. zeta potentialC. electrostaticD. none of these |
| Answer» Correct Answer - B | |
| 32. |
Select the non- eleastic gel out of the following :A. StarchB. agar-agarC. silicic acidD. gelatin |
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Answer» Correct Answer - C s |
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| 33. |
Silic a gel is commonly used as :A. wetting agentB. drying agentC. solventD. catalyst |
| Answer» Correct Answer - B | |
| 34. |
Blood contains .A. positively charged particlesB. negatively charged particlesC. neutral particlesD. negatively as well as positively charged colloids |
| Answer» Correct Answer - B | |
| 35. |
Detergent action of synthesis detergents is due to their.A. interfacila areaB. high molecular weightC. ionisationD. emulsifying properties |
| Answer» Correct Answer - D | |
| 36. |
(A) `NH_3CI` and `RCOONa` are colloidal electrolyte. (R) the substances which behave as electrolyte below a certain concentration limit, beyond this limit colloidal sol is formed, are called colloidal electrolyte.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 - A | |
| 37. |
the outcome of internal liquid of gel on shaking is called :A. syneresisB. imbibitionC. thixotropyD. precipitation |
| Answer» Correct Answer - C | |
| 38. |
Purple of Cassius isA. colloidal solutions of silverB. colloidal solution of goldC. colloidal solution of platinumD. oxy acids of gold |
| Answer» Correct Answer - B | |
| 39. |
Sol is a type of colloid in which :A. solid is dispeersed in liquidB. liquid is dispersed in solidC. gas is dispersed in liquidD. solid is dispersed in solid |
| Answer» Correct Answer - A | |
| 40. |
The colloidal solution of gelatin in known as :A. solvent lovingB. reversibleC. hydrophilicD. all of these |
| Answer» Correct Answer - D | |
| 41. |
The diameter of colloidal particle ranges fromA. `10^(-9)m` to `10^(-6)m`B. `10^(-9)m` to `10^(-12)m`C. `10^(3)m` to `10^(-3)m`D. `10^(-3)m` to `10^(-6)m` |
| Answer» Correct Answer - A | |
| 42. |
Gold sol not a :A. lyophobic solB. negatively charged solC. macromolecular solD. multimolecular colloid |
| Answer» Correct Answer - C | |
| 43. |
which of the following statements are true?A. flocculation value is inversely proportional to the coagulating power.B. colloidal silica is a protective colloidC. alum is used for cleaning muddy water.D. gelatin is added in ice cream. It acts as emulsifier. |
| Answer» Correct Answer - A,C,D | |
| 44. |
select the correct statements among the following :A. milk is emulsion of fat in water.B. an emulsifier stabilizes the emulsionC. emulsifier forms a thin film around the droplets of dispersed phase.D. milk is an emulsion of protein in water. |
| Answer» Correct Answer - A,B,C | |
| 45. |
Gelatin is generally added to ice creams. Why?A. prevent formation of a colloidB. stablize t he colloid and prevent crystallisationC. cause the mixture to solidify easilyD. improve flavour |
| Answer» Correct Answer - B | |
| 46. |
crystalloid and colloid differ with respect to :A. tyndall effectB. particle sizeC. diffusion through animal or vegatable membraneD. number of particels per unit volume of solution. |
| Answer» Correct Answer - A,B,C | |
| 47. |
Which is not lyophilic colloid ?A. milkB. gumC. fogD. blood |
| Answer» Correct Answer - C | |
| 48. |
Gold number is a measure of the :A. protective action by a lyophilic colloid on lyophobic colloidB. protective action by a lyophobic colloid on lyophilic colloidC. number of mg of gold in a standard red gold solD. none of the above |
| Answer» Correct Answer - A | |
| 49. |
Which of the following is the best protective colloid?A. Gelatin (Gold No.0.005)B. Starch (Gold No. 25)C. Gum arabic (Gold No.0.08)D. Egg albumin (Gold No. 0.08) |
| Answer» Correct Answer - A | |
| 50. |
Curd belongs to the type of colloidA. gelB. solC. emulsionD. solid foam |
| Answer» Correct Answer - A | |