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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.
| 51. |
In lead chambe process , which one of the following oxides is used as a catalysts ?A. NOB. `NO_(2)`C. `N_(2)O_(3)`D. `N_(2)O_(5)` |
| Answer» Correct Answer - A | |
| 52. |
Enzymes are made up ofA. edible proteinB. protiens with specific structureC. nitrogen containing carbohydratesD. carbohydrates |
| Answer» Correct Answer - B | |
| 53. |
The extent of adsorption of a gas on a solid depends on the :A. nature of gasB. pressure of the gasC. temperature of the gasD. all are correct |
| Answer» Correct Answer - D | |
| 54. |
Identify the correct statement regarding enzymes.A. Enzymes are specific biological catalysts that can normally function at very high temperatureB. Enzymes are normally hetrogeneous catalyst that are specific in actionC. Enzymes are specific biological catalysts that cannot be poisonedD. Enzymes are specific bological catalysts that posses well defined active site |
| Answer» Correct Answer - B | |
| 55. |
Adsorption is the phenomenon in which a substance :A. accumulates on the surface of the other substanceB. goes into the body of the other substanceC. remains close to the other substanceD. oxidises or reduces the other substance |
| Answer» Correct Answer - A | |
| 56. |
The inhibitors :A. retard the rate of a chemical reactionB. stop a chemical reaction immediatelyC. are reducing agentsD. donot allow the reaction to proceed |
| Answer» Correct Answer - A | |
| 57. |
Which acts as poison for Pd-charcoal in Lindlar catalyst ?A. `BaSO_(4)`B. QuinolineC. Both (a) and (b)D. none of above |
| Answer» Correct Answer - C | |
| 58. |
The rate of physisorption increases withA. decrease in temperatureB. increase in temperatureC. decrease in pressureD. decrease in surface area |
| Answer» Correct Answer - A | |
| 59. |
In which of the following processes, platinum is used as a catalystA. oxidation of ammonia to form nitric acidB. hardining of oilsC. production of synthetic rubberD. synthesis of methanol |
| Answer» Correct Answer - A | |
| 60. |
The role of a catalyst in a reversble reaction is toA. increase the rate of forward reactionB. decrease the rate of backward reactionC. alter the equilibrium constant of a reactionD. allow the equilibrium to be achieved quickly |
| Answer» Correct Answer - D | |
| 61. |
Which of the following is a shape selective cataltst ?A. `V_(2)O_(5)`B. `Cr_(2)O_(3)`C. Hydrated zeolitesD. ZSM-5 |
| Answer» Correct Answer - D | |
| 62. |
the process whichh is catalysed by one of the product is calledA. acid-base catalystB. autocatalystC. negative catalystD. positive catalyst |
| Answer» Correct Answer - B | |
| 63. |
Show that the maximum enzyme catalysed reaction rate will occur for `[H^(+)]_("opt")=sqrt(k_(1)k_(2)` The general pH control enzyme catalysed reaction is `EH_(2)^(2+) hArr EH^(+) hArr E` Only `EH^(+)` is capable for binding substrate and catalysing the desired reaction, `k_(1)=([EH^(+)][H^(+)])/([EH_(2)^(2+)]), k_(2) =([E][H(+)])/([EH^(+)]` |
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Answer» `k_(1)k_(2)=([E][H^(+)]^(2))/([EH_(2)^(2+)])` In pH control it may be considered that `[E]~~[EH_(2)^(2+)]`, i.e., enzyme combines almost completely with `H^(+)` ions. Thus, `k_(1)k_(2)~~[H^(+)],[H^(+)]=sqrt(k_(1)k_(2))` |
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| 64. |
Which can adsorbe large volume of hydrogen gas ?A. Colloidal solution of palladiumB. Finely divided nickelC. Finely divided platinumD. Collodial `Fe(OH)_(3)` |
| Answer» Correct Answer - A | |
| 65. |
Which of the following is/are application(s) of adsorption?A. De-ionisation of waterB. Gas marksC. Hygroscopic nature of `CaCl_(2)`D. Heterogenous catalysis |
| Answer» Correct Answer - C | |
| 66. |
Which of the following is the correct statement ?A. chemisorption is reversible in natureB. chemisorption is high at low temperatureC. chemisorption depends on the nature of gasD. chemisorption does not involve activation energy |
| Answer» Correct Answer - C | |
| 67. |
A catalyst is a substance whichA. increase the equlibrium concentration of the productB. changes the equlibrium constant of the reactionC. shortens the time to reach equlibriumD. supplies energy to the reaction |
| Answer» Correct Answer - C | |
| 68. |
A catalystA. increase the free energy change in the reactionB. decreases the free energy change in the reactionC. does not increase or decrease the free energy change in the reactionD. can either decrease or increase the free energy change depending on what catalyst we use |
| Answer» Correct Answer - C | |
| 69. |
Which of the following statements is more correct ?A. A catalyst only accelerates the rate of chemical reactionB. A catalyst can retard the rate of a chemical reactionC. A catalyst can control the speed of the reactionD. A catalyst alters the speed of the reaction |
| Answer» Correct Answer - D | |
| 70. |
A catalysts is a substance which :A. increase the equlibrium constant of the reactionB. increases the eulibrium concentration of productsC. does not alters the reaction mechanisD. changes the activation energy of te reaction |
| Answer» Correct Answer - D | |
| 71. |
Which of the following reactions is an examples of homogeneous catalysis ?A. `2H_(2)O_(2)(l) overset(MnO_(2)(s))to 2H_(2)O(l) +O_(2)(g)`B. `2SO_(2)(g) +O_(2)(g) overset(V_(2)O_(5)(s))to 2SO_(3)(g)`C. `2CO(g) + O_(2)(g) overset(NO(g))to 2CO_(2)(g)`D. `H_(2)(g) + C_(2)H_(4)(g) overset(Ni(s))to C_(2)H_(6)(g)` |
| Answer» Correct Answer - C | |
| 72. |
Which is false for catalyst ?A. A catalyst can initiate a reactionB. It does not alter the position of equilibrium in a reversible reactionC. A catalyst remains unchanged in quality and composition at the end of reactionD. Catalysts are sometimes very specific in reaction |
| Answer» Correct Answer - A | |
| 73. |
The curveshowing the variation of pressure with temperature for a given amount of adsorption is called :A. adsorption isobarB. adsorption isothermC. adsorption isotereD. adsorption isochore |
| Answer» Correct Answer - C | |
| 74. |
Which of the following statements is incorrect ?A. Adsorption always leads to a decrease in enthalpy and entropy of the system.B. Adsorption arises due to unsaturation of valence forces of atoms or molecules on the surface .C. Adsorption increases with rise in temperatureD. Adsorption decreases the surface energy. |
| Answer» Correct Answer - C | |
| 75. |
Which of the following statements is incorrect ?A. Enzymes exist in colloidal stateB. Enzymes are catalystsC. Enzymes can catalyse any reactionD. urease is an enzyme |
| Answer» Correct Answer - C | |
| 76. |
An enzyme which brings about the conversion of starch into maltose is known asA. maltaseB. zymaseC. invertaseD. diastase |
| Answer» Correct Answer - D | |
| 77. |
The correct statement (s) about surface properties is (are)A. Cloud is an emulsion type of colloidal in which liquid is dispersed phase and gas is dispersion mediumB. Adsorption is accompained by decrease in enthalpy and decrease in entropy of the systemC. Brownian motion of colloidal particles does not depend on the size of the particles but depends on viscosity of the solutionD. The critical temperature of ethane and nitrogen and 563K and 126 K, respectively . The adsorption of ethane will be more than of nitrogen on same amount of activated charcoal at a given temperature |
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Answer» Correct Answer - B::D Adsorption is invariabley exothermic i.e., `DeltaH=-` ve more it is spontaneous process and all the three thermodynamic parameters `DeltaG, DeltaH, DeltaS` are negative. Easily liquefiable gases with high critical temperature show high degree of adsorption . Then, adsorption of ethane will be more than that of nitrogen on same amount of activated charcoal at a given temperature. |
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| 78. |
Which of the following is present in gas mask ?A. Silica gelB. `V_(2)O_(5)`C. Activated charcoalD. Fluorescein |
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Answer» Correct Answer - A Activated charcoal is used in gas mask because air pollutants like `CO_(2), CH_(4), SO_(2), NO_(2)` etc., are absorbed on the surface of charcoal. |
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| 79. |
Following graphs will be true when : A. P = 0B. P = 1C. `(1)/(n)=0`D. `(1)/(n) =oo` |
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Answer» Correct Answer - C Adsorption is exothermic process, hence it is accompanied by decrease in enthalpy. |
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| 80. |
Adsorption is the tendency of accumulation of molecular species at the surface of solid or liquid. Depending upon the nature of bonds or forces of attraction between adsorbate and adsorbent. It is classified between physisorption and chemisorption. Which of the following gases is adsorbed most by activated charcoal?A. `CO_(2)`B. `N_(2)`C. `CH_(4)`D. `H_(2)` |
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Answer» Correct Answer - A `CO_(2)` is an easily liquefied easily, hence it is adsorbed most by charcoal. |
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| 81. |
Adsorption is the tendency of accumulation of molecular species at the surface of solid or liquid. Depending upon the nature of bonds or forces of attraction between adsorbate and adsorbent. It is classified between physisorption and chemisorption. Which of the following gas molecules have maximum value enthalpy of physisorption?A. `C_(2)H_(6)`B. NeC. `H_(2)O`D. `H_(2)` |
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Answer» Correct Answer - C Since, `H_(2)O` can be liqufied easily, hence it will have the maximum enthalpy of physisorption. |
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| 82. |
In Ziegler-Natta polymerisation of ehtylene , the active species are :A. `AlCl_(3)`B. `EtA`C. `Ch_(2)CH_(2)`D. `Ti^(3+)` |
| Answer» Correct Answer - D | |
| 83. |
(A) For adsorption `DeltaG`, `DeltaS`, and `DeltaH` all have negative value.(R) Adsorption is a spontanous process accompained by decrease in randomness.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 | |