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. |
Which of the following is/are not possible in case of autocatalysis?A. reactant catalysesB. heat produced in the reaction catalysesC. product catalysesD. solvent catalyses |
| Answer» Correct Answer - C | |
| 2. |
An example of autocatalytic reaction isA. hydrogenation of oilsB. decomposition of nitroglycerineC. oxidation of `Na_(3)AsO_(3)` in the presence of `Na_(2)SO_(3)`D. thermal decomption of `KClO_(3)` in the presence of `MnO_(2)` |
| Answer» Correct Answer - B | |
| 3. |
Which of the following substances adsorbs `H_(2)` gas most strongly ?A. Platinum blackB. Nickel powderC. Activated charcoalD. Silica gel |
| Answer» Correct Answer - A | |
| 4. |
the volume of gases `NH_(3) , CO_(2) and H_(2)` adsorbed by one gram of characoal at 300 K are in order of :A. `CH_(4) gt CO_(2) gt NH_(3)`B. `HN_(3) gt CH_(4) gt CO_(2)`C. `NH_(3) gt CO_(2) gt CH_(4)`D. `CO_(2) gt NH_(3) gt CH_(4)` |
| Answer» Correct Answer - C | |
| 5. |
In the reactions `2SO_(2) + O_(2) underset(As_(2)O_(3))overset(Pt)(rarr) 2SO_(3), As_(2)O_(3)` acts as aA. catalystic promoterB. induced catalystC. catalystic poisonD. autocatalyst |
| Answer» Correct Answer - C | |
| 6. |
In the Haber process of synthesis of `NH_(3)` :A. Mo acts as a catalyst and Fe as a promotorB. Fe acts as a catalysts and Mo as a promotorC. Fe acts as inhibitor and Mo as a promotorD. Fe acts as promotor and Mo as autocatalyst |
| Answer» Correct Answer - B | |
| 7. |
Efficiency of the catalysts depends on its :A. molecular weightB. number of free vallencyC. physical stateD. amount used |
| Answer» Correct Answer - B | |
| 8. |
Which of the following curves is in accordance with freundlich adsorption isotherm?A. B. C. D. |
| Answer» Correct Answer - A | |
| 9. |
The principle involved in the chromatographic operation is :A. adsorptionB. absorptionC. partitionD. none of above |
| Answer» Correct Answer - A | |
| 10. |
Protons accelerate the hydrolysis of esters . This is an example os :A. a promotorB. a hetrogeneous catalystC. an acid -base CatalystD. an autocatalyst |
| Answer» Correct Answer - C | |
| 11. |
Statements : A catalyst doesnot alter the equilibrium constant os a reaction . Expabnations : A catalyst complex with the reactants and provides an alternate path wirh a lower energy of activation for the reacton . The forwaord and forwad and reverse reactions are affected to the same extent .A. If both (A) and (R) are true and (R) is the correct explanation of (A).B. If both (A) and (R) are true but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) and (R) are both incorrect. |
| Answer» Correct Answer - A | |
| 12. |
Regarding criteria of catalysis which one of the following statements is not true ?A. The catalyst is unchanged chemically during the reactionB. A small quantity of catalyst is often sufficient to bring about a considerable amount of the reactionC. In reversible reaction ,the catalyst alters the equilibrium positionD. The catalyst accelerates the rate of reaction |
| Answer» Correct Answer - C | |
| 13. |
Which plot is the adsorption isobar for chemisorption?A. B. C. D. |
| Answer» Correct Answer - C | |
| 14. |
Substances which alter the velocity of a reaction by mere presence, without undergoing any change in mass and compossition are termed catalyst and the phenomenon is known as catalysis In homogenous catalytic reactions, there are three alternative paths A, B, and C (shown in figure). Which one of the following indicates the relative ease with which the reaction can take place? A. `A gt B gt C`B. `C gt B gt A`C. `B gt C gt A`D. A =B=C |
| Answer» Correct Answer - B | |
| 15. |
Assertion(A): In chemisorption, adsorption keeps on increasing with temperature. Reason(R): Heat keeps on providing more and more activation energy.A. If both (A) and (R) are true and (R) is the correct explanation of (A).B. If both (A) and (R) are true but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) and (R) are both incorrect. |
| Answer» Correct Answer - D | |
| 16. |
According to the adsorption theory of catalysis the speed of the reaction increases becauseA. adsorption lowers the activation energy of the reactionB. concentration of reactant molecules at the active centres of the catalyst becomes high bue to adsorptionC. adsorption produces heat which increases the rate of reactionD. adsorption increases the activation energy of the reaction |
| Answer» Correct Answer - B | |
| 17. |
Which is not the correct statement in respect of chemisorption ?A. Highly specific adsorptionB. Irreversible adsorptionC. Multilayered adsorptionD. Highly enthalpy of adsorption |
| Answer» Correct Answer - C | |
| 18. |
A finely divided state of the catalyst is more efficient because in this state :A. more surface area is availableB. more energy is stored in the catalystC. positive charge is acquiredD. negative charges is acquired |
| Answer» Correct Answer - A | |
| 19. |
In the presence of a catalyst, the activation energy is lowered by 3 Kcal at `27^(@)`c .Hence the rate of reaction will increase by :A. 32 timesB. 243 timesC. 2 timesD. 148 times |
| Answer» Correct Answer - D | |
| 20. |
Which of the following is not a favourable condition for physical adsorption?A. high temperatureB. high pressureC. higher critical temperature of adsorbateD. low temperature |
| Answer» Correct Answer - A | |
| 21. |
Which of the following acts as a negative catalysts ?A. Ehtanol in oxidation of cloroformB. Tetraethyl lead used as antiknocking agentC. Glycerol in the decomposition of `H_(2)O`D. Fe in the formation of ammonia by Haber process |
| Answer» Correct Answer - A::B::C | |
| 22. |
Which of the following are Zeolites ?A. GraniteB. FaujasiteC. NatroliteD. Thomisite |
| Answer» Correct Answer - B::C::D | |
| 23. |
Hydrogenation of vegeyable oils in presence of finely divided Nickel as catalyst. The rection is :A. hetrogeneous catalysisB. homogeneous catalysisC. enzyme catalysed reactionD. liquid catalysed reaction |
| Answer» Correct Answer - A | |
| 24. |
Zeolites are used as catalyst in :A. petrochemical industries during crackingB. the preparation of `H_(2)SO_(4)`C. The hydrolysis of waterD. All of above |
| Answer» Correct Answer - A | |
| 25. |
The mass of nickel catalyst recovered after being used in the hydrogenation of an oil is less than mass of nickel added to the reaction . (R) Catalyst take part in the reaction but are recovered in the end.A. If both (A) and (R) are true and (R) is the correct explanation of (A).B. If both (A) and (R) are true but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) and (R) are both incorrect. |
| Answer» Correct Answer - B | |
| 26. |
(A) ZSM-5 is used as a catalyst in petrochemical industries. (R) Zeolites are three-dimensional network silicates in which some atoms are replaced by luminium atoms.A. If both (A) and (R) are true and (R) is the correct explanation of (A).B. If both (A) and (R) are true but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) and (R) are both incorrect. |
| Answer» Correct Answer - B | |
| 27. |
(A) NO is used as ahomogeneous catalyst for oxidation of CO . `2CO +O_(2) to 2CO_(2)` NO increases the rate of oxidation.A. If both (A) and (R) are true and (R) is the correct explanation of (A).B. If both (A) and (R) are true but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) and (R) are both incorrect. |
| Answer» Correct Answer - B | |
| 28. |
Which of the following are correct about a catalyst ?A. it participates in the reaction but is recovered at lastB. it does not affect `DeltaG`C. It doesnot affect `DeltaH`D. It alters the mechanism of reaction |
| Answer» Correct Answer - A::B::C::D | |
| 29. |
The catalyst used in the manufacture of `H_(2)SO_(4)` by contact process isA. `Al_(2)O_(3)`B. `Cr_(2)O_(3)`C. `V_(2)O_(5)`D. `MnO_(2)` |
| Answer» Correct Answer - C | |
| 30. |
Platinised asbestos is used as a catalyst in the manufacture of `H_(2)SO_(4)`.It is an example of :A. homogenous catalystB. hetrogenous catalystC. autocatalystD. induced catalyst |
| Answer» Correct Answer - B | |
| 31. |
In the adsorption of oxalic acid on activated charcoal, the activated charcoal is calledA. adsorbentB. adsorbateC. adsorberD. none of above |
| Answer» Correct Answer - A | |
| 32. |
In the adsorption of oxalic acid on activated charcoal, the activated charcoal is calledA. absorberB. adsorbateC. adsorbentD. absorbate |
| Answer» Correct Answer - C | |
| 33. |
Give the mechanism of the following reactions: (a) In lead chamber process, NO(g) is used as catalyst in the oxidation of `SO_(2)` to `SO_(3)`. (b) NO(g) catalyses the decomposition ozone to oxygen. (c) Ozone layer depletion by freon or teflon. |
|
Answer» (a) `2NO(g)+O_(2)to underset("Intermediate")(2NO_(2))` `2NO_(2)(g)+2SO_(2)(g)toSO_(2)(g)+2NO(g)` OR `SO_(2)(g)+H_(2)O+NO_(2)(g)tounderset("Intermediate")(H_(2)SNO_(5))` `H_(2)SNO_(5)toH_(2)SO_(4)+NO(g)` (b) `NO(g)+O_(3)(g)toNO_(2)(g)+O_(2)(g)` `O_(3)(g)toO_(2)(g)+O(g)` `NO_(2)(g)+O(g)toNO(g)+O_(2)(g)` `2O_(3)(g)to3O_(3)(g)` (Overall reaction) (c ) Chlorine atoms furnished by fieon and teflon act as a catalyst in the decomposition of ozone in the ozone layer. `O_(3)overset("Sunlight")toO_(2)+[O]` `O_(3)+Cl toO_(2)+OCl` `OCl+OtoCl+O_(2)]` |
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| 34. |
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at `25^(@)C` . For process, the correct statement isA. The adsorption requires activation at `25^(0)`C.B. The adsorption is accompained by a decrease in enthalpyC. The adsorption increases with increase in temperatureD. The adsorption is irreversible |
| Answer» Correct Answer - B | |
| 35. |
Identify the gas which is readily adsorbed by activated charcoal?A. `N_(2)`B. `H_(2)`C. `O_(2)`D. `SO_(2)` |
| Answer» Correct Answer - D | |
| 36. |
One gram of charcoal adsorbs 100 mL of 0.5 `M CH_(3)COOH` to form a mono-layer and thereby the molarity of acetic acid is reduced to 0.49 M. Calculate the surface area of the charcoal adsorbed by each molecule of acetic acid. Surface acid of charcoal `=3.01xx10^(2) m^(2)//gm` |
|
Answer» Number of moles of acetic acid initially present `(MV)/(100)=(0.5xx100)/(1000) =0.05` Number of moles of acetic acid left `=(MV)/(1000)=(0.5xx100)/(1000)=0.049` Number of moles of acetic acid adsorbed =0.05-0.049=0.001 mol Number of molecules of acid adsorbed `=0.001xx6.023xx10^(23)=6.023xx10^(20)` Area occupied by single molecule of acetic acid `=("Total area")/("Number of molecules adsorbed")` `=(3.01xx10^(2))/(6.023xx10^(20))` `=5xx10^(-19)m^(2)` |
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| 37. |
The Langmuir adsorption isotherm is deduced using the assumption.A. the adsorption sites are equivalent in their ability to adsorb the particlesB. the heat of adsorption vaies with coverageC. the adsorbed molecules interact with each otherD. the adsorption take place in multilayers |
| Answer» Correct Answer - A | |
| 38. |
The colloidal system consisting of a liquid adsorbete in a solid adsorbent is termed as:A. aerosolB. foamC. emulsionD. gel |
| Answer» Correct Answer - D | |
| 39. |
Adsorpton of gases on solid surface is generally exothermic because :A. nthalpy is positiveB. entropy decreasesC. entropy increasesD. free energy increases |
| Answer» Correct Answer - B | |
| 40. |
The substance which decreases the rate of a chemical reaction is called :A. inhibitorB. poisonC. moderatorD. promotor |
| Answer» Correct Answer - A | |
| 41. |
The temperature at which the catalystic activity of the catalysts is maximum ,is calledA. critical temperatureB. room temperatureC. absolute temperatureD. optimum temperature |
| Answer» Correct Answer - D | |
| 42. |
The decomposition of hydrogen peroxide can be slowed by the addition of a small amount of acetamide. The latter acts as aA. inhibitorB. promotorC. moderatorD. poison |
| Answer» Correct Answer - A | |
| 43. |
The name catalysis was given by :A. RutherfordB. LangmuirC. GrahamD. Berzelius |
| Answer» Correct Answer - D | |
| 44. |
In the reaction `KMnO_(4) + H_(2)SO_(4) + H_(2)C_(2)O_(4) to` products, `Mn^(2+)` ions act as:A. positive catalystsB. negative catalystC. autocatalystD. enzyme catalyst |
| Answer» Correct Answer - C | |
| 45. |
The efficiency of an enzyme to catalyse a reacrtion is due to its capacity to:A. reduce the activation energy of the reactionB. form strong enzyme-substrate moleculesC. decrease the bond energy of the catalyst -substrate reactionD. alter the substrate geometry to fit into the shape of the enzyme molecules |
| Answer» Correct Answer - A | |
| 46. |
Which of the following is true in respect of chemical adsorption?A. `DeltaG lt 0, DeltaS gt 0, DeltaH lt 0`B. `DeltaG lt 0, DeltaS lt 0, DeltaH lt 0`C. `DeltaG gt 0, DeltaS gt 0, DeltaH lt 0`D. `DeltaG gt 0, DeltaS gt 0, DeltaH gt 0` |
| Answer» Correct Answer - B | |
| 47. |
If x/m is the mass of adsorbate adsorbed per unit mass of adsorbent, P is the pressure of the adsorbate gas ,a and b are constant ,which of the following represent "Langmuir adsorption isotherm"?A. `"log"((x)/(m))="log"((a)/(b))+(1)/(a)"log"P`B. `(x)/(m)=(b)/(a)+(1)/(aP)`C. `(m)/(x)=(1+bP)/(aP)`D. `(1)/((x//m))=(a)/(b)+(P)/(a)` |
| Answer» Correct Answer - C | |
| 48. |
which of the following is used to adsorb water ?A. Silica gelB. anhydrous `CaCl_(2)`C. coalD. coke |
| Answer» Correct Answer - A | |
| 49. |
Select the correct option for the following graph : A. `T_(1)gt T_(2) gt T_(3)`B. `T_(1)=T_(2)=T_(3)`C. `T_(1) lt T_(2) lt T_(3)`D. `T_(1) gt T_(2) lt T_(3)` |
| Answer» Correct Answer - C | |
| 50. |
Glucose or fructose is converted into `C_(2)H_(5)OH` in the presence of ?A. invertaseB. diastaseC. maltaseD. zymase |
| Answer» Correct Answer - D | |