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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.
| 601. |
In petrochemical industry, alcohols are directly coverted to gasoline by passing over heated:-A. PlatinumB. ZSM-5C. IronD. Nickel |
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Answer» Correct Answer - B Such a reaction is an application of shape selective catalysis. ZSM-5 is a shape selective catalyst. Zeoplites are good shape selective catalysts because of the honey comb like structure. They are microporous aluminosilicates with 3-D structure. The reaction taking place in zeolites depend upon the size and shape of reactant and product molecules as well as upon pores and cavities of the zeolites. |
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| 602. |
A catalyst is a substance whichA. Increases the rate of the forward reactionB. Decreases the value of enthalpy change in the reactionC. Reduces the time required for reaching the equilibrium state in the reactionD. Decreases the rate of the reverse reaction |
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Answer» Correct Answer - C In the reversible reaction a catalyst is the substance which reduces the time required for reaching the equilibrium state in the reaction. |
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| 603. |
The function of gum arabic in the preparation of Indian ink isA. CoagulationB. PeptizationC. Protective actionD. Absorption |
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Answer» Correct Answer - C Gum-arabi has protective power hence the function of it ion I preparation of indian ink is protective action. |
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| 604. |
Assertion: According to Freundlich: `x/m k.P^(1//n)` Reason: The isotherm shows variation of the amount of gas adsorbed with temperature.A. if both assertion and reason are true and the reason is the correct explanation of the assertion.B. if both assertion and reson are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - C Assertion is true but reason is false. Freundlich adsorption isotherm gives as empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. |
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| 605. |
Assertion: Increase in surface area, increases rate of evaporation. Reason: Stronger the intermolecular attactive forces, first is the rate of evaporation at a given temperatureA. if both assertion and reason are true and the reason is the correct explanation of the assertion.B. if both assertion and reson are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - C It is true that if we increase the surface area the rate of evaporation also increase3 as evaporation is always takes place from the surface, bot if the intermolecular attraction is stronger than the rate of evaporation is slower. |
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| 606. |
Which of the following graph yield a straight line?A. `x//m` vs pB. log `x//m` vs pC. `x//m` vs log pD. log `x//m` vs log p |
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Answer» Correct Answer - D Equation of straight line for adsorption is `log ""(x)/(m)=log k+(1)/(n) logp` . Thus, plot between `log ""(x)/(m)` vs log p gives a straight line. |
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| 607. |
At low pressure, the fraction of the surface covered follows.A. zero-order kineticsB. first order kineticsC. second order kineticsD. fractional order kinetics |
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Answer» Correct Answer - B As `(x)/(m)=kp^(1//n)` At low pressure `(x)/(m) prop p` (graph is nearly a straight line) Thus, the reaction follows first order kinetics. |
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| 608. |
Some of the important characteristics of emulsion are as (i) Particle size is the ranges from 1000 Å to 10,000 Å (ii) It shows Brownia motion (iii) It exhibit Tyndall effect Point out the correct statementA. (i) and (ii)B. (ii) and (iii)C. (i) and (iii)D. all of these |
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Answer» Correct Answer - D All the statements are correct . |
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| 609. |
Stability of an emulsion is determined byA. toughness of the emulsifier filmB. electric change on emulsified particlesC. Both (a) and (b)D. None of the above . |
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Answer» Correct Answer - C Stability of an emulsion is determined by the toughness of the emulsifier film and by the electric charge on emulsified particles . |
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| 610. |
Adsorption of gaseous moleculesof hydrogen on Pd is known asA. reductionB. occlusionC. hydrationD. hydrogenation |
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Answer» Correct Answer - B Occlusion is a property to accumulate gas on solid surface . |
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| 611. |
Extent of adsorption isA. temperature dependentB. pressure dependentC. surface area dependentD. All of the above |
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Answer» Correct Answer - D Extent of adsorption is dependent on temperature , pressure and surface area . |
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| 612. |
Gas mask is prepared on the basis of adsorption becauseA. it causes absorption of poisonous gases on activated charcoalB. it causes absorption of gaseous particleC. it increases oxygen molecule around the atmosphere by decreasing concentration of poisonous gasesD. Both (a) and (c) |
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Answer» Correct Answer - D Poisonous gases get adsorbed by activated charcoal hence , concentration of poisonous gases around atmosphere decreases and concentration of oxygen increases . |
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| 613. |
During adsorption , which of the following has negative value ?A. `Delta H`B. `Delta G`C. `Delta S`D. All of these |
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Answer» Correct Answer - D For spontaneous adsorption , `Delta H = -`ve `Delta G = -`ve and `Delta S = -` ve |
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| 614. |
Which of the following gases present in a polluted area will be absorbed most easily on the charcoal gas mask ?A. `H_(2)`B. `O_(2)`C. `N_(2)`D. `SO_(2)` |
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Answer» Correct Answer - D Easily liquefiable gases like `CO_(2), NH_(3), SO_(2)` , etc. are more easily absorbed than the elemental gases like `H_(2), N_(2), O_(2)` , etc. |
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| 615. |
The role of the activation charcoal in gas mask used coal mine isA. absorption of poisonous gasesB. adsorption of poisonous gasesC. neutralisation of gasesD. None of the above . |
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Answer» Correct Answer - B Activated charcoal is used for the adsorption of poisonous gases on its surface . |
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| 616. |
Cationic surfactants areA. `C_(17)H_(35)COONa`B. C. D. `C_(16)H_(33)N(CH_(3))_(3)Cl` |
| Answer» Correct Answer - C::D | |
| 617. |
Mnon-ionogenic surfactants areA. B. `C_(17)H_(35)COONa`C. `C_(n)H_(2n+1)(OCH_(2)CH_(2))_(x)OH`D. All |
| Answer» Correct Answer - C | |
| 618. |
Micelles areA. Ideal solutionB. Associated colloidsC. Adsorbed surfaceD. Absorbent solutions |
| Answer» Correct Answer - B | |
| 619. |
Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?A. Reverse osmosis takes placeB. Electroosmosis takes placeC. Dispersion medium begins to moveD. Dispersion medium becomes stationary |
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Answer» Correct Answer - B::C The movement of colloidal particles under an applied electric potential is called electrophoresis . When this dispersion medium begins to move in an electric field. This phenomenon is termed as electroosmosis. |
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| 620. |
Explain the Coagulation. |
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Answer» Coagulation : The stability of the lyophilic sols is due to the presence of charge on the colloidal particles. If this charge is neutralised the particles will come nearer to each other to form aggregates (or coagulate) and settle down under the force of gravity. This process of settling down of colloidal particles is called coagulation (or) flocculation (or) precipitation. `to`Coagulation of lyophobic sols can be carried out by i) Electrophoresis, ii) Boiling, iii) Adding Electrolytes, iv) Prolonged dialysis etc. |
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| 621. |
Energy of activation of forward and backward reaction are equal in case (numerical calues) whereA. `DeltaH=0`B. No catalyst presentC. `DeltaS=0`D. Stoichiometry is the mechanism |
| Answer» Correct Answer - A | |
| 622. |
Gold number of a lyophic sol is such a property thatA. The larger its value, the greater is the peptizing power.B. The lower its value, the greater is the peptizing power.C. The lower its value, the greater is the peptizing power.D. The larger its value, the greater is the protecting power. |
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Answer» Correct Answer - C The reciprocal of gold number is directly proportional to the protecting power. |
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| 623. |
Catalyst used in polymerization of ethen is:A. `TiCl_(4)` and `AIR_(3)`B. `Fe,Co`C. `H_(3)PO_(4)`D. `Zeolites |
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Answer» Correct Answer - A For polymerization of ethene, `Fe` and `Co` is used. |
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| 624. |
Which is not the correct statement for a catalyst?A. It does not alter `E_(a)` .B. The surface of a catalyst adsorbs reactantC. Catalyst may form intermediates with reactants.D. Action of enzyme catalyst is always specific. |
| Answer» Correct Answer - C | |
| 625. |
Which of the following is present at the time of cracking of hydrocarbons?A. CopperB. ZeoliteC. NickelD. Molybdenum |
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Answer» Correct Answer - A Catalyst changes the activation energy `(E_(a))` . |
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| 626. |
Which of the following catalyst is used during the hydrogenation of oil?A. `Fe`B. `Ni`C. `Pt`D. `Mo` |
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Answer» Correct Answer - B `Ni` is used for catalytic hygrogenation of oil, |
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| 627. |
Catalyst increases the rate byA. Decreasesing `E_(a)`B. Increasing `E_(a)`C. Decreasing entropyD. Increasing entropy |
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Answer» Correct Answer - A::C Catalyst decreases the activation energy for the reaction hence reaction speeds up. It also decreases entropy (more negative), therefore, free energy less positive or more spontaneous. |
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| 628. |
Which one of the following statements is correct?A. Brownian movement is more pronounced for smaller particles than for bigger ones.B. Sols of metal sulphides are lyophilic.C. Hardy Schulze law states, the bigger the size of the ions, the greater is its coagulating power.D. One would expect charcoal to adsorb chlorine more strongly than hydrogen sulphide. |
| Answer» Correct Answer - A | |
| 629. |
Compared to common colloidal sols milcells have:A. Higher colligative propertiesB. Lower colligative propertiesC. Same colligative propertiesD. None is ture |
| Answer» Correct Answer - B | |
| 630. |
Blue colour of the sky is due to a. Adsorption of light by dust particles b. Reflection of light by dust particles c. Scattering of light by dust particles d. Pressure of clouds which are a colloidal dispersion of water particles in air |
| Answer» Blue colour of sky is due to scattering of light by dust particle (Tyndall effect). Blue colour of sky is due to scattering of light by dust particle (Tyndall effect). | |
| 631. |
What type of colloidal sols are formed in the following: a. Sulphur vapours are passed through cooled water. b. White of an egg is mixed with water. c. Soap solution. |
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Answer» a. Multimolecular because sulphur molecules associate together to form colloidal sol. b. Macromolecular because protein molecules present in the white of the egg are macromolecules soluble in water. c. Associated because `RCO O` ions associate together to from micelles. a. Multimolecular because sulphur molecules associate together to form colloidal sol. b. Macromolecular because protein molecules present in the white of the egg are macromolecules soluble in water. c. Associated because `RCO O` ions associate together to from micelles. |
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| 632. |
Assertion : The micelle formed by sodium stereate in water has `-COO^(-)` groups at the surface. Reason : Surface tension of water is reduced by the addition of stereate.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 - A Reason is the correct explanation for assertion. |
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| 633. |
Positive sol is :A. GoldB. GelatinC. `As_(2)S_(3)`D. `Al_(2)(SO_(4))_(3)` |
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Answer» Correct Answer - B Gelatin is positive sol. |
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| 634. |
Positive sol is :A. GoldB. gelatinC. `As_(2)S_(3)`D. none of these |
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Answer» Correct Answer - B |
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| 635. |
Which one of the following is not a colloidal solution?A. SmokeB. InkC. AirD. Blood |
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Answer» Correct Answer - C |
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| 636. |
The diameter of collodal particle is of the orderA. `10^(-3)m`B. `10^(-6)m` .C. `10^(-15)m` .D. `10^(-7)m` |
| Answer» Correct Answer - D | |
| 637. |
Fog is an example ofA. liquid dispersed in gasB. gas dispersed in gasC. solid dispersed in gasD. solid dispersed in liquid |
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Answer» Correct Answer - A |
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| 638. |
Fog is a collodal solution of:A. solid in gasB. gas in gasC. iliquid in gasD. gas in liquid. |
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Answer» Correct Answer - C Fog is a colloidal solution of liquid in a gas. |
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| 639. |
When excess of eletroyte is added to a colloid itA. CoagulatsB. precipitatesC. Gets dilutedD. Doe not change |
| Answer» Correct Answer - A | |
| 640. |
The purification of the colloidal particles from crystalloid dimensions through semipermeable membrane is known asA. CoagluationB. DialysisC. UltrafiltrationD. Peptisation |
| Answer» Correct Answer - B | |
| 641. |
The natural semipermeable membrane is:A. Phenol layeB. `Ca_(3)(PO_(4))_(2)`C. `Cu_(2)[Fe(CN)_(6)]`D. All of these |
| Answer» Correct Answer - C | |
| 642. |
The passing of solvent particles through semipermeable membrane is called:A. Moelcules of solventB. Complex ionsC. Simple ionsD. Molecules of solute |
| Answer» Correct Answer - A | |
| 643. |
Colloids can be purified by :A. condensationB. peptizationC. coagulationD. dialysis |
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Answer» Correct Answer - d |
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| 644. |
Which of the following ions can cause coagulation of protons ?A. `Ag^(+)`B. `Na^(+)`C. `Mg^(++)`D. `Ca^(++)` |
| Answer» Correct Answer - A | |
| 645. |
Artifical rain is caused by spraying :A. opposite charged collidal dust over a cloudB. same charged collidal dust over a cloudC. bothD. none of these |
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Answer» Correct Answer - a |
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| 646. |
Pick out te statement which is not relevant in the discussion of colloidsA. Sodium aluminium silicate is used in the softening of hard waterB. Potash alum is used in shaving rounds and as antiseptic in medicineC. Artificial rain is caused by throwing electrified sand on the clouds from an aeroplaneD. Deltas are formed at a place where the river pours its water into the sea |
| Answer» Correct Answer - A | |
| 647. |
Artifical rain is caused by spraying :A. is easy to spray at high altitudesB. Is easy to synthesizeC. Has crystal structure similar to iceD. Is insoluble in water |
| Answer» Correct Answer - C | |
| 648. |
`As_(2)S_(3)` sol is ,A. magnesium nitrateB. Potassium nitrateC. Potassium sulphateD. Aluminium nitrate |
| Answer» Correct Answer - D | |
| 649. |
In order to cause coagulation of 200 ml of gold sol, 585 ml 1% w/w NaCl solution having density 1.2 gm/ml was required. What will be the coagulation value of NaCl? (Express answer in milli-moles/litre) |
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Answer» Correct Answer - 600 |
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| 650. |
the minimum amount of an electrolyrte required to cause coagulation of a sol is called :A. Coagulation valueB. Gold numberC. protective valueD. None of these |
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Answer» Correct Answer - a |
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