MCQOPTIONS
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MCQOPTIONS
This section includes 409 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Rate of a chemical reaction is not affected by the____________________? |
| A. | Catalyst |
| B. | Temperature |
| C. | Reactant’s concentration |
| D. | Number of molecules of reactants taking part in the reaction |
| Answer» E. | |
| 152. |
Rate of a chemical reaction is independent of the concentration of the reactants for a _________________ reaction? |
| A. | Zero order |
| B. | Third order |
| C. | Consecutive |
| D. | None of these |
| Answer» B. Third order | |
| 153. |
Rate determining step in a reaction consisting of a number of steps in series is the ______________ step? |
| A. | Fastest |
| B. | Slowest |
| C. | Intermediate |
| D. | Data insufficient; can’t be predicted |
| Answer» C. Intermediate | |
| 154. |
Rate constant ‘k’ and absolute temperature ‘T’ are related by collision theory (for bimolecular) as______________________? |
| A. | k ∝ T1.5 |
| B. | k ∝ exp(-E/RT) |
| C. | k ∝ √T |
| D. | k ∝ T |
| Answer» D. k ∝ T | |
| 155. |
Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 156. |
Radioactive decay follows ______________ order kinetics? |
| A. | First |
| B. | Second |
| C. | Third |
| D. | Zero |
| Answer» B. Second | |
| 157. |
Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene: 95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether: 2.5 kmole/hr. The reactions occuring can be represented by: C2H5OH → C2H4 + H2O 2C2H5OH → C2H5 – O – C2H5 + H2O The percent conversion of ethanol in the reactor is________________? |
| A. | 100 |
| B. | 97.5 |
| C. | 95 |
| D. | 2.5 |
| Answer» B. 97.5 | |
| 158. |
Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________? |
| A. | 1/2 |
| B. | 1/3 |
| C. | 1/4 |
| D. | 1/5 |
| Answer» C. 1/4 | |
| 159. |
Promoter is added to the catalyst to improve its____________________? |
| A. | Porosity |
| B. | Sensitivity |
| C. | Surface area |
| D. | None of these |
| Answer» C. Surface area | |
| 160. |
Promoter_____________________? |
| A. | Initiates a chemical reaction and is a catalyst by itself |
| B. | Alters the position of equilibrium in a reversible reaction |
| C. | Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals |
| D. | All A., B. and C. |
| Answer» D. All A., B. and C. | |
| 161. |
Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k1/k2). CA a-b ? |
| A. | Use high pressure and eliminate inerts, when a > b |
| B. | Avoid recycle, when a > b |
| C. | Use batch reactor or plug flow reactor, when a > b |
| D. | Use CSTR with a high conversion, when a > b |
| Answer» C. Use batch reactor or plug flow reactor, when a > b | |
| 162. |
Pick out the wrong statement pertaining to space velocity of flow reactors? |
| A. | The unit of space velocity is (time)-1 |
| B. | The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour |
| C. | The space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor |
| D. | None of these |
| Answer» D. None of these | |
| 163. |
Photochemical reaction rate does not depend significantly on temperature, because____________________? |
| A. | It is a reversible reaction |
| B. | It is an exothermic reaction |
| C. | The energy of reacting molecules exceeds the activation energy by absorption of light |
| D. | None of these |
| Answer» D. None of these | |
| 164. |
Photo-chemical reactions occur in presence of ___________________? |
| A. | Sunlight |
| B. | Darkness |
| C. | Solid catalysts |
| D. | Monochromatic radiation only |
| Answer» B. Darkness | |
| 165. |
Participation of _______________ is involved in the occurrence of a chemical reaction? |
| A. | Protons |
| B. | Neutrons |
| C. | Electrons |
| D. | None of these |
| Answer» D. None of these | |
| 166. |
Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually ________________ the concentration of catalyst, if it does not entail a chain mechanism? |
| A. | Proportional to |
| B. | Independent of |
| C. | Inversely proportional to |
| D. | Proportional to the square of |
| Answer» B. Independent of | |
| 167. |
Organic catalysts differ from the inorganic catalyst in the sense that the former is________________? |
| A. | Active at cryogenic temperatures only |
| B. | Prohibitively costly |
| C. | Proteinous in nature |
| D. | Active at very high temperature only |
| Answer» D. Active at very high temperature only | |
| 168. |
On application of pressure to the equilibrium system, ice ⇌ water; which of the following phenomenon will occur ? |
| A. | Water will evaporate |
| B. | Equilibrium will not be attained |
| C. | More ice will be formed |
| D. | More water will be formed |
| Answer» E. | |
| 169. |
Oil is hydrogenated using nickel catalyst in a __________________ reactor? |
| A. | Batch |
| B. | Slurry |
| C. | Fluidised bed |
| D. | Fixed bed |
| Answer» C. Fluidised bed | |
| 170. |
Non-catalytic fluid-solid reactions are represented by _______________ model? |
| A. | Continuous reaction |
| B. | Unreacted core |
| C. | Both A. and B. |
| D. | Neither A. and B. |
| Answer» D. Neither A. and B. | |
| 171. |
‘N’ plug flow reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for _______________ order reactions? |
| A. | First |
| B. | Second |
| C. | Third |
| D. | Any |
| Answer» E. | |
| 172. |
‘n’ number of plug flow reactors (P.F.R) in series with a total volume ‘V’ gives the same conversion as one P.F.R. of volume________________? |
| A. | V/n |
| B. | V |
| C. | V.n |
| D. | 1/V |
| Answer» C. V.n | |
| 173. |
Most important characteristics of gas-liquid reactors are the________________? |
| A. | Specific inter-facial area |
| B. | Liquid hold-up |
| C. | Both A. and B. |
| D. | None of these |
| Answer» D. None of these | |
| 174. |
Molecularity of an elementary reaction, P + Q → R + S is ____________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 175. |
Molecularity of a reaction__________________? |
| A. | Is always equal to the overall order of reaction |
| B. | May not be equal to the order of reaction |
| C. | Can’t have a fractional value |
| D. | Both B. and C. |
| Answer» E. | |
| 176. |
Mean residence time is equal to the space time, when_________________? |
| A. | The feed rate is measured at temperature and pressure in the reactor |
| B. | The temperature, pressure and the density of reaction mixture remains constant throughout the reactor |
| C. | There is no change in number of moles in gaseous reaction |
| D. | All A., B. and C. |
| Answer» E. | |
| 177. |
Maximum equilibrium conversion for endothermic reaction is obtained at the ______________ temperature? |
| A. | Highest possible |
| B. | Lowest possible |
| C. | Intermediate |
| D. | Room |
| Answer» B. Lowest possible | |
| 178. |
Limiting reactant in a chemical reaction decides the____________________? |
| A. | Rate constant |
| B. | Conversion |
| C. | Reaction speed |
| D. | Equilibrium constant |
| Answer» C. Reaction speed | |
| 179. |
Knudsen diffusion is directly proportional to _____________________? |
| A. | T |
| B. | √T |
| C. | 1/√T |
| D. | T2 |
| Answer» C. 1/√T | |
| 180. |
Kinetics of a solid catalysed reaction can best be studied in a _________________ reactor? |
| A. | Batch |
| B. | Plug-flow |
| C. | Mixed |
| D. | None of these |
| Answer» D. None of these | |
| 181. |
Kinetics of a catalytic reaction can be best studied on a/an ______________ reactor? |
| A. | Mixed |
| B. | Integral (plug flow) |
| C. | Differential (flow) |
| D. | Either A., B. and C. |
| Answer» E. | |
| 182. |
______________ is the response curve for a step input signal from a reactor ? |
| A. | S-curve |
| B. | C-curve |
| C. | I-curve |
| D. | None of these |
| Answer» C. I-curve | |
| 183. |
____________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction ? |
| A. | Gas film diffusion |
| B. | Ash diffusion |
| C. | Chemical reaction |
| D. | None of these |
| Answer» D. None of these | |
| 184. |
Ionic reactions occur in____________________? |
| A. | Solid state only |
| B. | Liquid state only |
| C. | Solutions |
| D. | Any state |
| Answer» D. Any state | |
| 185. |
Inversion of cane sugar is an example of ______________________? |
| A. | Unimolecular reaction with first order |
| B. | Bimolecular reaction with second order |
| C. | Bimolecular reaction with first order |
| D. | Unimolecular reaction with second order |
| Answer» D. Unimolecular reaction with second order | |
| 186. |
Integral method for analysing the kinetic data is used _____________________? |
| A. | When the data are scattered |
| B. | For testing specific mechanisms with simple rate expressions |
| C. | Both A. and B. |
| D. | None of these |
| Answer» D. None of these | |
| 187. |
In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased ? |
| A. | H2 + Cl2 ⇌ 2HCl |
| B. | N2 + O2 ⇌ 2NO |
| C. | N2O4 ⇌ 2 NO2 |
| D. | H2 + I2 ⇌ 2HI |
| Answer» C. N2O4 ⇌ 2 NO2 | |
| 188. |
In which of the following gaseous phase reversible reactions, the product yield cannot be increased by the application of high pressure ? |
| A. | N2 + O2 ⇌ 2NO |
| B. | PCl3 + Cl2 ⇌ PCl5 |
| C. | N + 3H2 ⇌ 2NH3 |
| D. | 2SO2 + O2 ⇌ 2SO3 |
| Answer» B. PCl3 + Cl2 ⇌ PCl5 | |
| 189. |
In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes ? |
| A. | 2O3 ⇌ 3O2 |
| B. | N2 + O2 ⇌ 2NO |
| C. | 2NO2 ⇌ N2O4 |
| D. | 2SO2 + O2 ⇌ 2SO3 |
| Answer» C. 2NO2 ⇌ N2O4 | |
| 190. |
In the reversible reaction of the type, A + B ⇌ AB, in general__________________? |
| A. | Both forward and backward reactions will be exothermic |
| B. | Neither of the reactions will be endothermic |
| C. | The combination reaction will be exothermic, while the dissociation reaction will be endothermic |
| D. | The combination reaction will be endothermic, while the dissociation reaction will be exothermic |
| Answer» D. The combination reaction will be endothermic, while the dissociation reaction will be exothermic | |
| 191. |
In the hydrodealkylation of toluene to benzene, the following reactions occur: C7H8 + H2 → C6H6 + CH4 2C6H6 ⇌ C12H10 + H2 Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is_______________________? |
| A. | 0.16 |
| B. | 0.144 |
| C. | 0.152 |
| D. | 0.136 |
| Answer» C. 0.152 | |
| 192. |
In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3), the value of the equilibrium constant depends on the_________________? |
| A. | Total pressure of the system |
| B. | Volume of the reactor |
| C. | Temperature |
| D. | Initial concentration of N2 and H2 |
| Answer» D. Initial concentration of N2 and H2 | |
| 193. |
In the fluid catalytic cracker (FCC), the cracking reaction is _____________ (i) and the regeneration is _______________ (ii) _______________? |
| A. | (i) exothermic (ii) endothermic |
| B. | (i) exothermic (ii) exothermic |
| C. | (i) endothermic (ii) endothermic |
| D. | (i) endothermic (ii) exothermic |
| Answer» E. | |
| 194. |
In the converter of the contact process for the manufacture of H2SO4 the equilibrium conversion of SO2__________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO2 to air? |
| A. | (i) increases (ii) decreases |
| B. | (i) decreases (ii) increases |
| C. | (i) increases (ii) increases |
| D. | (i) decreases (ii) decreases |
| Answer» C. (i) increases (ii) increases | |
| 195. |
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for________________? |
| A. | Fast reactions in catalyst of small pore diameter |
| B. | Fast reaction in catalyst of large pore diameter |
| C. | Slow reactions in catalyst of small pore diameter |
| D. | Slow reactions in catalyst of large pore diameter |
| Answer» D. Slow reactions in catalyst of large pore diameter | |
| 196. |
In Langmuir treatment of adsorption,_________________? |
| A. | Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule |
| B. | Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site |
| C. | All the adsorption does not take place by the same mechanism |
| D. | Extent of adsorption is more than one complete monomolecular layer on the surface |
| Answer» C. All the adsorption does not take place by the same mechanism | |
| 197. |
In flow reactors, the performance equations interrelate the rate of reaction to the___________________? |
| A. | Feed rate |
| B. | Reactor volume |
| C. | Extent of reaction |
| D. | All A., B. and C. |
| Answer» E. | |
| 198. |
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a ______________ reaction ? |
| A. | Non-catalytic homogeneous |
| B. | Non-catalytic heterogeneous |
| C. | Catalytic homogenous |
| D. | Catalytic heterogeneous |
| Answer» D. Catalytic heterogeneous | |
| 199. |
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is___________________? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Either A. or B., depends on other factors |
| Answer» D. Either A. or B., depends on other factors | |
| 200. |
In case of _____________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds? |
| A. | Catalytic |
| B. | Parallel |
| C. | Series |
| D. | Auto catalytic |
| Answer» E. | |