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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.
| 801. |
Which of the following is true in respect of chemical adsorption?A. `Delta H lt0Delta S gt0, DeltaG gt 0`B. `Delta H lt0,Delta S lt0, DeltaG lt 0`C. `Delta H gt0,Delta S gt0, DeltaG gt 0`D. `Delta H gt0,Delta S lt0, DeltaG gt 0` |
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Answer» Correct Answer - b |
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| 802. |
Adsorption due to strong chemical force is calledA. ChemisorptionB. PhysisorptionC. Reversible adsorptionD. Both (b) and (c) |
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Answer» Correct Answer - A Adsorption due to strong chemical bond is called chemical adsorption or chemisorption or Langmuir adsorption. |
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| 803. |
Zeolites are :A. water softenerB. catalystC. Both a and bD. none of these |
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Answer» Correct Answer - C Zeolites are used to make soft water from hard water as well as catalyst in petrochemical industruy due to their sghape selective bature or activity because of different pore sizes and cavity sizer on their surface . |
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| 804. |
Zeolites :A. are microporous aluminosilicateB. have general formula `M_(x//n) [ (AlO_2)x (Sio_2)_4] . mH_2O`.C. have pore sizes beteen ` 260 pm` to ` 740` pm`D. all of these |
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Answer» Correct Answer - D Note theese characteristics of Zeolites . |
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| 805. |
The pressure of `H_(2)` required to make the potential of `H_(2)-`electrode zero in pure water at 289K is :A. `10^(-4)atm`B. `10^(-14)atm`C. `10^(-12)atm`D. `10^(-10)atm` |
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Answer» Correct Answer - B `2H_(aq.)^(+) = 2_(e-) rarr H_(2)` (reduction reaction) as pure water has `(H^+) = (-OH)=10^(-7)` `E = E^(@)-(0.059)/(2) log(P_(H_2))/([H_(aq)^(+)]^(2))` `0-0.059/2 log(P_(H_2))/([10^(-7)]^(2))` so as to make `E = 0, log(P_(H_2))/([H_(2)^(+)]^(2)) = 0` which is only possible when `P_(H_2) = 10^(-14)` so log`(P_(H_2))/([H^(+)]^(2)) = log(10^(-14))/(10^(-14)) = log 1 = 0`. |
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| 806. |
On which of the following properties does the coagulating power of an ion depend?A. The magnitude of the charge on the ions alone.B. Size of the ion aloneC. Both magnitude and sign of the charges on the ionD. The sign of charge on the ion alone |
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Answer» Correct Answer - B According to Hardy Schulze rule: The coagulating power of an ion depend on both magnitude ans sign of the charge of the ion. |
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| 807. |
On which of the following properties does the coagulating power of an ion depend?A. The magnitude of the charge on the aloneB. Size of the ion aloneC. Both magnitude and sign of the charge the ionD. The sign of charge on the ion alone |
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Answer» Correct Answer - C According to Hardy Schulze rule: the coagulating power of an ion depend on both magnitude and sign of the charge of the ion. |
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| 808. |
Gas masks containing activated chrcoal to remove poisonous gases from atmosphere act on principle ofA. AdsorptionB. absorptionC. sorptionD. All of these |
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Answer» Correct Answer - A Charcoal always do adsorption. |
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| 809. |
0.2g of fine animal charcoal is mixed with half litre of acetic acid solution and shaken for 30 minutesA. Concentration remains sameB. Concentration increasesC. concentration of the solution decreaseD. none of these |
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Answer» Correct Answer - C Concentration of the solution decreases because acetic acid gets adsorbed on charcoal. |
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| 810. |
Activated charcoal is used to remove colouring matter from pure substance, it works byA. OxidationB. ReductionC. BleachingD. Adsorption |
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Answer» Correct Answer - D it has been observed that the surface of a solid (or liquid) has the tendency to attract and retain the molecules of other immiscible phases with which it is brought into contact. These molecules remain only at the surface and do not go deeper into the bulk. This tendency of accumulation of molecular species at the surface then in the bulk of a solid (or liquid) it termed adsorption. |
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| 811. |
Catalysts are more effective inA. finely powdered stateB. colloisdal astateC. rough surfaceD. all of these |
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Answer» Correct Answer - D Larger is surface area, more is efficiency of catalyst . The surface area becomes more in finely divided state, colloidal state or if surface si rough . |
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| 812. |
The equation for Freundlich adsorption isotherm isA. `x/m kp^(1//n)`B. `X = mkp^(1//n)`C. `x//m = kp^(-n)`D. All of these |
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Answer» Correct Answer - D `x/m = kp^(1//n) or x = m.kp^(1//n) or x//m = kp^(-n)` All of these equation represent freundlich adsorption isotherm. |
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| 813. |
Catalysts are more effective inA. Finely powdered stateB. Colloidal stateC. Rough surfaceD. All of these |
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Answer» Correct Answer - D Catalysts are more effective any from (state). |
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| 814. |
Adsorption due to strong chemical force is calledA. chemisorptionsB. physisorptionC. Reversible adsorptionD. Both (b) and (c ) |
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Answer» Correct Answer - A Adsorption due to strong chemical bond is called chemical adsorption or chemisorption or Langmuir adsorption. |
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| 815. |
Water vapours can be adsorbed and absorbed respectibely byA. Silica gel and `CaCl_(2)`B. Chalk and `CaCl_(2)`C. `CaCl_(2)` and silica gelD. `CaCl_(2)` and chalk |
| Answer» Correct Answer - A | |
| 816. |
Following is the variation of physical adsorption with temperature.A. B. C. D. |
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Answer» Correct Answer - B As temperature increases, physical adsorption decrease because physical adsorption is exthermic and reversible process. |
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| 817. |
`ZSM-5 ` is used to conver :A. alcohol to petrolB. benzene to toluenC. toluene to benzenD. heptance to toluene |
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Answer» Correct Answer - A ` ZSM - 5` acts as an effective catalyst to convert alcohol to convert alcohol to alkances (petrol ). |
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| 818. |
Following is the variation of physical adsorption with temperature.A. B. C. D. |
| Answer» Correct Answer - B | |
| 819. |
The hydrolysis of ethylmethanoate is slow in beginning and becomes taster after some time as it is autocatalysed byA. MethanolB. EthanolC. Methanoic acidD. Ethanoic acid |
| Answer» Correct Answer - C | |
| 820. |
What is common in aqua sols and solid aerosol? How do they differ? |
| Answer» Aquasol and solid aerosol both have solid as the dispersed phase. They differ in dispersion medium. Aquasol have water as the dispersion mediium, while aerosols have gas as the dispersion medium. Aquasol and solid aerosol both have solid as the dispersed phase. They differ in dispersion medium. Aquasol have water as the dispersion mediium, while aerosols have gas as the dispersion medium. | |
| 821. |
Define colloidal solution? |
| Answer» A colloidal solution is a state in which the particle size lies between `1nm` and `100nm` . It appears to be homogeneous but actually it is heterogeneous. A colloidal solution is a state in which the particle size lies between `1nm` and `100nm` . It appears to be homogeneous but actually it is heterogeneous. | |
| 822. |
Colloidion which is solution of nitro-cellulose in a mixture of alcohol and ether is usedA. To coagulate colloidal particlesB. To make ultra filter paperC. As emulsifying agentD. For tanning |
| Answer» Correct Answer - B | |
| 823. |
What is colloidion? |
| Answer» Colloidion is cellulose nitrate peptized by ethanol. Colloidion is cellulose nitrate peptized by ethanol. | |
| 824. |
Which of the following is a protective colloid?A. Higher the gold number,more protective power of colloidB. Lower the gold number, more the protective powerC. Higher the coagulation value, more tha coagulating powerD. Lower the coagulation value, higher the coagulating power |
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Answer» Correct Answer - B::D (bd) (b) and () are correct because lower the gold number means less amount of protective colloid is required. Lower the coagulation value, more will be te coagulating power (a) and (c) are wrong as explained above. |
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| 825. |
Which of the following is not lyophilicA. Gelatin solB. Silver solC. Sulphur solD. `As_(2)S_(3)` sol |
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Answer» Correct Answer - B::C::D (bcd) (b) silver sol, (c) sulphur powder in water and (d) `As_(2)S_(3)` sol are lyophobic whereas (a) gelatin sol in water is lyophilic whereas (a) Gelatin sol in wate4r is lyophilic (a) is not correct |
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| 826. |
In which of the following processes, platinum is used as a catalystA. Oxidation of ammonial to from nitric acidB. Hardening of oilsC. Production of synthetic rubberD. Synthesis of methanol |
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Answer» Correct Answer - A `4NH_(3)+5O_(2) underset(1100K)overset(Pt gaua g e)(rarr) 4NO overset(O_2)(rarr) 4NO_(2) overset(2H_(2)O+O_(2))(rarr)4HNO_(3)` |
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| 827. |
which of the following is true about catalyst?A. It initiates reactionB. it change equilibrium pointC. it increase average kinetic energyD. It accelerates the rate of reaction |
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Answer» Correct Answer - D Catalyst is a substance which change the rate of reaction without affecting the overall energetics of the reaction. |
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| 828. |
The efficiency of an enzyme in catalysing a reaction is due to its capacity:-A. to formm a strong enzyme-substrate complexB. to decrease the bond energies of substrate moleculeC. to change the shape of the substrate moleculeD. to lower the activation energy of the reaction. |
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Answer» Correct Answer - D Efficiency of catalysing property is inversely proportional of activation energy. |
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| 829. |
The transition metal used as a catalyst isA. NickelB. PlatinumC. CobaltD. All of these |
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Answer» Correct Answer - D `Ni`, `Pt` and `Co` all three transition metal are used as a catalysts. |
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| 830. |
The effieciency of an enzyme in catalysing a reaction is due to its capacityA. To form a strong enzyme-substrate complexB. to decreases the bond energies of substrate moleculeC. To change the shape of the substrate moleculeD. To lower the activation energy of the reaction |
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Answer» Correct Answer - D Efficiency of catalysing property is inversely proportional of activation energy. |
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| 831. |
Enzymes areA. Substances made chemists to activate washing powderB. Very active vegetable catalystsC. Catalysts found in organismD. Synthetic catalysts |
| Answer» Correct Answer - C | |
| 832. |
Enzymes with two sites are calledA. ApoenzymeB. HoloenzymeC. Allosteric enzymeD. Conjugate enzyme |
| Answer» Correct Answer - C | |
| 833. |
Followin are the serms about ac itivty and selectivity: I. Acitivity is the ability of catalysts to accelerate chemical reactions and selectivity is the ability of catalysts to direct reaction to yield particular products. II. Activity is the ability of catalyst and selectivity is the ability of catalysts to accelerate chemical reactions. Select the correct term :A. IB. IIC. I and II bothD. none of these. |
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Answer» Correct Answer - A Only term (I) is correct. This has relavence in shape selective catalysts. For example, in catalyst ZSN-5, the nature of the products such as linear and branched iso-alkanes and benzene derivatives depends upon the pore size of the zeolite. |
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| 834. |
1 mole of `AgI//Ag^(+)` sol is coagulated byA. 1 mol of KIB. 500 mL of 1M `K_(2)SO_(4)`C. 300 mL of 1M `Na_(3)PO_(4)` solutionD. 1 ml of AgI |
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Answer» Correct Answer - A::B::D `underset("1 mol")([AgI]Ag^(+))+underset("1 mol")(KI)to2AgI+K^(+)` `undersetunderset(1" mol")("2 mol")(2[AgI]Ag^(+))+undersetunderset("0.5 mol")("1 mol")(K_(2)SO_(4))to2AgI+As_(2)SO_(4)=500mL` of `1M" "K_(2)SO_(4)` |
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| 835. |
Enzymes areA. Biochemical catalystsB. Nitrogenous organic compoundsC. Produced by living plants and animalsD. All of these |
| Answer» Correct Answer - D | |
| 836. |
which of the following reaction is catalysed by enzyme maltase?A. `Starch rarr mal t o se`B. `Starch rarr mal t o se`C. `Lact ose rarr mal t o se`D. `Mal t o se rarr gluco se + f ruct ose` |
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Answer» Correct Answer - B `Mal t osh underset(Enzyme)overset(Mal t ose)(rarr) Glucose` |
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| 837. |
Which of the following statements are true for physisorption ?A. Extent of adsorption increases with increase in pressure.B. It needs activation energyC. It can be reversed easilyD. It occurs at high temperature. |
| Answer» Correct Answer - A::C | |
| 838. |
Which of the following is (are) colloid (s) ?A. smokeB. Ruby glassC. Pumic stoneD. Chlorophyll |
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Answer» Correct Answer - A::B::C (a) Smoke is colloidal solution of carbon particle in air (b) Ruby glass is colloidal solution of coloured oxides in silicate. (c) Pumic stone is a colloidal solution (d) Chlorophyll does not form colloidal solution. |
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| 839. |
Which of the following is not an example of enzyme catalysed reaction?A. Hydrogenation of vegetable oilsB. Inversion of cane sugarC. Conversion of proteins into peptides in intestineD. Conversion of milk into curd |
| Answer» Correct Answer - A | |
| 840. |
Identify the reactions that includes inhibtors in the reactions mixture.A. `N_(2) + 3H_(2) overset(Fe)underset(Mo)to 2NH_(3)`B. Vegetable Oil `+ H_(2) overset(Ni)underset(Cu)to` Vegetable ghee.C. `N_(2) + 3H_(2) overset(Fe)underset(Co//H_(2)S)to 2NH_(3)`D. `RCOCl + H_(2) overset(Pd)underset(BaSO_(4))to RCHO + HCl` |
| Answer» Correct Answer - C::D | |
| 841. |
What is the role of a catalyst in a catalysed reactionA. Lowers the activation energyB. Increases the activation energyC. Affects the free energy changeD. Affects the enthalpy change |
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Answer» Correct Answer - A All substance have average energy and before the reaction occurs energy of the reactant should be higher than the average energy. We also know that catalyst lower the activation energy. Therefore, rate of reaction is increased. |
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| 842. |
Which of the following are the correct :A. A Catalyst remains unchanged in mass and chemical composition at the end of reactions.B. Finely devided state of catalyst is more efficient for the reactions.C. Catalyst change equilibrium state of the reaction.D. A catalyst changes the entropy and the free energy of a reaction. |
| Answer» Correct Answer - A::B | |
| 843. |
Activity And Selectivity Of Catalysts |
| Answer» Activity is the ability of catalyst to acceleration chemical reactions. Activity is the ability of catalyst to acceleration chemical reactions. | |
| 844. |
The diameter of colloidal particle is of the order :A. `10^(-3)m`B. `10^(-6)m`C. `10^(-15)M`D. `10^(-7)m` |
| Answer» Correct Answer - B::D | |
| 845. |
The diameter of colloidal particle is of the orderA. `10^(-3)` mB. `10^(-6) ` mC. `10^(-15)`mD. `10^(-7)` m |
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Answer» Correct Answer - B The diameter of colloidal particle is of the order `10^(-6)` m . |
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| 846. |
Enzyme activity is highest in the temperature range ofA. `0 15^(@)` CB. `15 - 25^(@) C`C. `25-45 ^(@) C`D. remain same in all |
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Answer» Correct Answer - B Enzyme activity is highest in the temperature range of `15-25^(@)C`. |
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| 847. |
Which of the following are correct statements ?A. Spontaneous adsorption of gases on solid surface is an exothermic process as entropy decreases during adsorptionB. Formation of micelles takes place when temperature is below Kraft Temperature `(T_(k))` and concentration is above critical micelle concentration (CMC)C. Longer the length of hydrophobic chain, smaller is the value of critical micelle concentration (CMC)D. According to Hardy-Schulze rule the coagulation (flocculating) value of `Fe^(3+)` ion will be more than `Ba^(2+)` or `Na^(+)`. |
| Answer» Correct Answer - A::C | |
| 848. |
Depending upon the type of the particles of the dispersed phase, colloids are classified as.A. multimolecular colloidsB. macromolecular colloidsC. associated colloidsD. all of these |
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Answer» Correct Answer - D Multimolecular colloids are formed when (on dissolution) a large number of atoms (or small molecules) of a substance aggregate together to form species having sixe in the colloidal range (diameter`lt1mm`). Macromolecular colloids are formed when macromolecules form solution (in suitable solvents) in which the size of the macromolecules lies in the colloidal range. Associated colloids are those substance which behave as normal strong electrolytes at law concentratioons but exhibit colloidal behaviour (at higher concentrations) due to the formation of aggregates. The aggregated particles so formed are called micelles. |
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| 849. |
Collidal dispersion have been classified into different types depending upon the physical state of the dispersed phases and the dispersion medium. They are prepared in the industry or in the laboratory by a number of methods and then purified. The protective action of lyophilic colloids was studied by Zsigmondy and he introduced a term called gold number. Criticle micelle concentration `(CMC)` of saop solution lies in the range.A. `10^(-6)-10^(-5)M`B. `10^(-5)-10^(-4)M`C. `10^(-3)-10^(-2)M`D. `10^(-4)-10^(-3)M` |
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Answer» Correct Answer - D `CMC` of soaps lies in the range `10^(-4)` and `10^(-3)molL^(-1)` Correct Answer - D `CMC` of soaps lies in the range `10^(-4)` and `10^(-3)molL^(-1)` |
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| 850. |
Collidal dispersion have been classified into different types depending upon the physical state of the dispersed phases and the dispersion medium. They are prepared in the industry or in the laboratory by a number of methods and then purified. The protective action of lyophilic colloids was studied by Zsigmondy and he introduced a term called gold number. Which of the following will have maximum flocculation value for aresnic sulphide sol?A. `BaCl_(2)`B. `NaCl`C. `KCl`D. `AlCl_(3)` |
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Answer» Correct Answer - B `Ag_(2)S_(3)` is a negative sol Less is the valency of the positive ion, greater is the flocculation value (i.e., greater is the amount of the electrolyte required to be added for coagulation) out of `Na^(o+)` and `K^(o+)` ions. `Na^(o+)` ions have greater flocculation value `(52)` than `K^(o+)(49.5)` . Correct Answer - B `Ag_(2)S_(3)` is a negative sol Less is the valency of the positive ion, greater is the flocculation value (i.e., greater is the amount of the electrolyte required to be added for coagulation) out of `Na^(o+)` and `K^(o+)` ions. `Na^(o+)` ions have greater flocculation value `(52)` than `K^(o+)(49.5)` . |
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