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.
| 551. |
Which of the following interface cannot be obtained?A. Liquid=liquidB. Solid-liquidC. Liquid-gasD. Gas-gas |
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Answer» Correct Answer - D Gas-gas interface can not be obtained as they are completely miscible in nature. e.g. ,air is a mixture of various gases such as, `O_(2),N_(2),CO_(2),` etc. |
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| 552. |
Which of the following sols is positively charged ?A. Arsenious sulphideB. Aluminium hydroxideC. Ferric hydroxideD. Silver iodide in silver nitrate solution |
| Answer» Correct Answer - B::C::D | |
| 553. |
Which of the following interface cannot be obtained?A. liquid-liquidB. solid liquidC. liquid-gasD. gas-gas |
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Answer» Correct Answer - D Gas-gas combination is always homogenous in nature. |
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| 554. |
An example of intrinsic colliod (lyophilic colloids) is :A. `As_(2)S_(3) sol`B. `Fe(OH)_(3) sol`C. Egg albuminD. Au sol |
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Answer» Correct Answer - C |
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| 555. |
At the equilibrium position in the process of adsorption …………A. `DeltaH gt 0`B. `DeltaH = TDeltaS`C. `DeltaH gt TDeltaS`D. `DeltaH lt TdeltaS` |
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Answer» Correct Answer - B `DeltaG` = 0 at equilibrium therefore, `DeltaH=TDeltaS.` |
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| 556. |
At the equilibrium position in the process of adsorption …………A. `DeltaH gt 0`B. `DeltaH =T DeltaS`C. `DeltaH gt T DeltaS`D. `Delta gt T DeltaS` |
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Answer» Correct Answer - B At equilibrium , `DeltaG=0` `DeltaG=DeltaH-TDeltaS` `therefore DeltaH=T DeltaS` |
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| 557. |
Which of the folowing process does not occur at the interface of phases?A. CrystallisationB. Heterogeneous catalysisC. homogeneous catalysisD. Corrosion |
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Answer» Correct Answer - C In homogeneous catalysis, the reactants and the catalyst are in the same phase. Thus, there is no interface in homogenous catalysis. |
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| 558. |
which of the following statements is correct for a lyophilic solution?A. It is not easily solvatedB. It is unstableC. The coagulation of this sol is irreversible in natureD. It is quite stable in a solvent |
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Answer» Correct Answer - D |
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| 559. |
Which fo the folowing statement is not correct for a lyophobic solution?A. It can be easily solvatedB. It carries chargesC. The coagulation of this sol is irreversible in natureD. It is less stable in a solvent |
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Answer» Correct Answer - A |
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| 560. |
Which is not correct statement in respect to chemisorption?A. Highly specific adsorptionB. Irreversible adsorptionC. Multilyer adsorptionD. High negative enthalpy of adsorption. |
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Answer» Correct Answer - C Chemisorption is monolayer in nature. |
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| 561. |
What is dialysis ? How is dialysis can be made fast ? |
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Answer» Dialysis : The process of removing a dissolved substance from a colloidal solution using a suitable membrane is called dialysis. `to` Dialysis is made faster by applying an Emf. This is known as Electrodialysis. |
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| 562. |
What is collodion? |
| Answer» `4%` solution of nitrocellulose in a mixture of alcohal and ether is called collodion. | |
| 563. |
Assertion (A) An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles. Reason (R) Pore size of the filter paper becomes more than the size of colloidal particle.A. Assertion and reson both are correct and the reason is correct explation os assertion.B. Assertion and reson both are correct but reason does not explain assertion.C. Assertion is correct but reason is incorrect.D. Both assertion and reason are incorrect. |
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Answer» Correct Answer - c Correct Reason. Pore size of the filter paper becomes lesser than the size of colloidal particles. |
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| 564. |
What is collodion solution ? |
| Answer» Collodion solution : Collodion is a 4% solution of nitro cellulose in a mixture of alcohol and ether. | |
| 565. |
Following reaction is an example of `4NH_(3)(g)+50_(2)(g)overset(Pt(s)) (rarr) 4NO(g) + 6H_(2) O (g)`A. Homogeneous catalysisB. Heterogeneous catalysisC. Enzyme catalysisD. Peptization |
| Answer» Correct Answer - B | |
| 566. |
Which statement is incorrect for chemisorption?A. It is an exothermic processB. It increases with increase in surface areaC. It is highly specificD. It is recersible in nature |
| Answer» Correct Answer - D | |
| 567. |
If gold number of `A, B, C, and D` are `0.005, 0.05, 0.5 and 5` respectively , then which of the following will have the highest protective powerA. AB. BC. CD. D |
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Answer» Correct Answer - A Protective power`prop(1)/("Gold number")` Gold number of A is least, therefore, it has the highest protective power. |
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| 568. |
Gold number is maximum for the lyophilic sol isA. GelatinB. HaemoglobinC. Sodium oleateD. Potato starch |
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Answer» Correct Answer - D Gold number shows the protective power of a lyophilic solution . Lasser the gold number, greater will be the protecting power of that colloid. Gelatin is one of the best protective colloid. Among the given colloids . Potato starch has maximum gold number. |
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| 569. |
If gold number of `A, B, C, and D` are `0.005, 0.05, 0.5 and 5` respectively , then which of the following will have the highest protective powerA. `A`B. `B`C. `C`D. `D` |
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Answer» Correct Answer - A protective power `prop (1)/("Gold number")` Gold number of `A` is least, therefore, it has the highest protective power. |
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| 570. |
Purple of Cassius isA. Colloidal solution of goldB. Colloidal solution of silverC. Colloidal solution of platinumD. Oxyacids of gold |
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Answer» Correct Answer - A Colloidal solution of gold is called purple of cassius. |
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| 571. |
The formation of micelles takes place only aboveA. Inversion temperatureB. Boyle temperatureC. Critical temperatureD. Kraft temperature |
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Answer» Correct Answer - D Micelles formation takes place above kraft temperature. |
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| 572. |
Which of the following will not form a colloidal system ?A. Solid-gasB. Liquid-gasC. Gas-gasD. Gas-liquid |
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Answer» Correct Answer - C Gas-gas is a true solution. |
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| 573. |
Which of the following is not the correct difference between lyophobic and lyophilic sols ?A. `{:("Lyophobic sols","Lyophilic sols methods for preparation"),("Require special","Can be prepard by shaking with the solvent"):}`B. `{:("Lyophobic sols","Lyophilic sols methods for preparation"),("Are reversible","Are irreversible"):}`C. `{:("Lyophobic sols","Lyophilic sols methods for preparation"),("Easily coagulated by electrolytes","Cannot be easily"):}`D. `{:("Lyophobic sols","Lyophilic sols methods for preparation"),("Are less stable","Are more stable"):}` |
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Answer» Correct Answer - B Lyophobic sols are irreversible while lyophilic sols are reversible. |
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| 574. |
Which of the following is not correctly matched ?A. Gelatin -Lyophilic colloidB. Gold sol-Lyophilic colloidC. Arsenious sulphide-Lyophobic colloidD. Ferric hydroxide-Lyophobic colloid |
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Answer» Correct Answer - B Gold sol is a lyophobic colloid. |
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| 575. |
Assertion : Oxidation of `Na_(2)SO_(3)` is not caused by air but in the presence of `Na_(3)AsO_(3).` Reason : `Na_(3)AsO_(3)` can be oxidised by air.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 : The oxidation is caused by the phenomenon of induced oxidation. |
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| 576. |
Methods for preparing colloidal sols are :A. hydrolysisB. coagulationC. peptisationD. dispersion. |
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Answer» Correct Answer - A::C::D are correct answers. |
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| 577. |
Compared to common colloidal sols milcells have:A. higher colligative properties B. lower colligative propertiesC. same colligative propertiesD. None of these |
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Answer» Correct Answer - B |
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| 578. |
the colloidal sols are purified byA. dialysisB. peptizationC. filtrationD. oxidation |
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Answer» Correct Answer - A |
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| 579. |
Movement of dispersion medium under the influence of electric field is known asA. electrodialysisB. electrophoresis C. ElectroosmosisD. cataphoresis |
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Answer» Correct Answer - C When movement of particles (electrophoresis) is prevented by some suitable means, it is observed that the dispersion medium begins to move in an electric field. This phenomenon is termed as electroosmosis. |
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| 580. |
Colloidal solution of a liquid dispersed in solid is called gel. |
| Answer» Correct Answer - T | |
| 581. |
Adsorption is aways exothermic. |
| Answer» Correct Answer - T | |
| 582. |
Gelatin has the minimum protective powers. |
| Answer» Correct Answer - F | |
| 583. |
Metal sol is negatively charged. |
| Answer» Correct Answer - T | |
| 584. |
Which one of the following is a false statement?A. Cell fluid is an example of solB. Jelly is an example of gelC. Hair cream is an exmaple of emulsionD. Cheese is an example of emulsion |
| Answer» Cheese is an example of a gel (i.e. liquid dispersed in a solid). | |
| 585. |
The coagulating power of electrolytes having inos `Na^(o+),Al^(3+)` and `Ba^(2+)` for arsenic sulphide sol increases in the orderA. `Al^(3+) lt Ba^(2+) lt Na^(+)`B. `Na^(+) lt Ba^(2+) ltAl^(3+)`C. `Ba^(2+) lt Na^(2+) lt Al^(3+)`D. `Al^(3+) lt Na^(+) lt Ba^(2+)` |
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Answer» Correct Answer - B |
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| 586. |
The charge on the colloidal particle is due to preferential adsorption of inos. |
| Answer» Correct Answer - T | |
| 587. |
The coagulating power of electrolytes having inos `Na^(o+),Al^(3+)` and `Ba^(2+)` for arsenic sulphide sol increases in the orderA. `Al^(3+)ltBa^(2+)ltNa^(+)`B. `Al^(3+)ltNa^(+)ltBa^(2+)`C. `Ba^(2+)ltNa^(+)ltAl^(+)`D. `Na^(+)ltBa^(2+)ltAl^(3+)` |
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Answer» Correct Answer - D Arsenic sulphide `(As_(2)S_(3))` is an anionic sol (negatively charged sol). Thus, its coagulation will depend upon coagulating power of cation. According to Hardy-Schulze rule, higher the valency of the coagulating ion added, the greater is its power to cause precipitation. `Na^(+)ltBa^(2+)ltAl^(3+)` |
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| 588. |
Colloids represent a state of ……………..and not a class od substances. |
| Answer» Correct Answer - Matter | |
| 589. |
Finely powered or colloidal catalyst particles having……………..surface…………………..are rich in ………………………… valencies. |
| Answer» Correct Answer - Large, area, free | |
| 590. |
Enzymes are highely……………………in action. |
| Answer» Correct Answer - Spcific | |
| 591. |
Chemical equilibrium is…………… by a catalyst. |
| Answer» Correct Answer - Not affected | |
| 592. |
The effect of a catalyst in a chemical reaction is to change the :A. Does not initiate a reactionB. Increases the activation energy of the reactionC. Changes the equilibrium constant of a reactionD. Does not change the rate of the reaction |
| Answer» Correct Answer - A | |
| 593. |
Following reaction is catalysed by `Br^(-)` `2H_(2)O_(2)(aq) rarr 2H_(2)O(/) + O_(2) (g)` This is an example ofA. homogeneous catalysisB. heterogeneous catalysisC. autocatalysisD. enzyme catalysis |
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Answer» Correct Answer - A `2H_(2) O_(2) (aq) overset(Br^(-) (aq))(to) 2 H_(2) O (l) + O_(2) (g)` This is an example of homogeneous catalysis . |
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| 594. |
Zeolites are :-A. Water softnerB. CatalystC. cation exchangerD. All of these |
| Answer» Correct Answer - D | |
| 595. |
i. The ability of a catalyst to direct the reaciton to yield particular products is called a. Reactivity b. Selectivity c. Activity d. Fugacity ii. Which of the following Is an example of zeolite? a. `ZSM-5` b. `AgNO_(3)` c. `Mg(OH)_(2)` d. `Co(OH)_(3)` (iii) Reactions in zeolite catalyst depends on a. Pores b. Apertures c. Size of cavities d. All of theseA. reactivityB. selectivityC. activityD. fugacity |
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Answer» Correct Answer - B The ability of the catalyst is to direct the reaction to yield particular product is called selectivity . |
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| 596. |
Which of the following catalyst is used during the hydrogenation of oil?A. FeB. NiC. PtD. Mo |
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Answer» Correct Answer - B Ni(Nickel) is used during the rate by decreasing . |
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| 597. |
Catalyst increases the rate byA. by decreasing `E_(a)`B. by increasing `E_(a)`C. by increasing entropyD. by both (a) and (c) |
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Answer» Correct Answer - A Catalyst increases the rate by decreasing . |
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| 598. |
Assertion :- A gas mixed with another gas forms a colloidal solution. Reason :- Mixture of gases is homogenous system.A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.C. If Assertion is True but the Reason is False.D. If both Assertion & Reason are False. |
| Answer» Correct Answer - D | |
| 599. |
Which can be used as a catalyst in an esterification reaction? (P) NaOH (Q) `H_(2)SO_(4)`A. P onlyB. Q onlyC. Both P and QD. Neither P and Q |
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Answer» Correct Answer - B |
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| 600. |
Ultramicroscope works on the principle of :A. Light reflectionB. Light absorptionC. Light scatteringD. Light polarisation |
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Answer» Correct Answer - C Zsigmondy ultramicroscope based on scattering of light by sol particles. |
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