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.
| 201. |
In case of physical adsorption, the heat of adsorption is of the order of _____________ kcal/kg mole? |
| A. | 100 |
| B. | 1000 |
| C. | 10000 |
| D. | 100000 |
| Answer» C. 10000 | |
| 202. |
In case of calcination of limestone, CaCO3 CaO + CO2, the addition of more of CaO will result in _______________ in the concentration of CO2? |
| A. | No change |
| B. | Increase |
| C. | Decrease |
| D. | Unpredictable from the data |
| Answer» B. Increase | |
| 203. |
In case of a/an ______________ chemical reaction, conversion increases with the rise in temperature? |
| A. | Reversible exothermic |
| B. | Irreversible exothermic |
| C. | Irreversible endothermic |
| D. | Reversible endothermic |
| Answer» E. | |
| 204. |
In case of a _____________ reactor, the composition in the reactor and at the exit of the reactor is the same ? |
| A. | Semi-batch |
| B. | Tubular |
| C. | Batch |
| D. | Back-mix |
| Answer» E. | |
| 205. |
In case of a P.F.R., there__________________________? |
| A. | May be lateral mixing of fluid |
| B. | Should not be any mixing along the flow path |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 206. |
In autocatalytic reactions ? |
| A. | One of the reactants acts as a catalyst |
| B. | One of the products acts as a catalyst |
| C. | Catalysts have very high selectivity |
| D. | No catalyst is used |
| Answer» C. Catalysts have very high selectivity | |
| 207. |
In an ideal tubular-flow reactor_________________? |
| A. | There is no mixing in longitudinal direction |
| B. | Mixing takes place in radial direction |
| C. | There is a uniform velocity across the radius |
| D. | All A., B. and C. |
| Answer» E. | |
| 208. |
In an ideal P.F.R. at steady state conditions ___________________? |
| A. | The composition of reactants remains constant along a flow path |
| B. | The conversion of the reactant varies from point to point along a flow path |
| C. | There is no lateral mixing of fluid |
| D. | There may be diffusion along the flow path |
| Answer» C. There is no lateral mixing of fluid | |
| 209. |
In an ideal mixed reactor (at steady state), the ___________________? |
| A. | Space time is equivalent to holding time for constant density systems |
| B. | Composition throughout the reactor remains same |
| C. | Exit stream has the same composition as the fluid within the reactor |
| D. | All A., B. and C. |
| Answer» E. | |
| 210. |
In an exothermic reaction, the energy of the reacting substances as compared to that of products is____________________? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Either A. or B., depends on order of reaction |
| Answer» B. Less | |
| 211. |
In an exothermic chemical reaction, the reactants compared to the products have__________________? |
| A. | Higher temperature |
| B. | More energy |
| C. | Less energy |
| D. | Same energy |
| Answer» C. Less energy | |
| 212. |
In a/an _____________ vessel, the fluid enters and leaves following plug flow? |
| A. | Open |
| B. | Closed |
| C. | Open-closed |
| D. | Close-opened |
| Answer» C. Open-closed | |
| 213. |
In a/an ______________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation? |
| A. | Adiabatic |
| B. | Isothermal |
| C. | Non-adiabatic |
| D. | None of these |
| Answer» D. None of these | |
| 214. |
In a zero order reaction, reactants concentration does not change with time and the_________________? |
| A. | Time for half change is half the time taken for completion of the reaction |
| B. | Time for half change is independent of the initial concentration |
| C. | Time for completion of the reaction is independent of the initial concentration |
| D. | Reaction rate is trebled when the initial concentration is trebled |
| Answer» B. Time for half change is independent of the initial concentration | |
| 215. |
In a semi-batch reactor _____________________? |
| A. | Velocity of reaction can be controlled |
| B. | Maximum conversion can be controlled |
| C. | Both the reactants flow counter-currently |
| D. | Residence time is constant |
| Answer» B. Maximum conversion can be controlled | |
| 216. |
In a semi-batch reactor __________________? |
| A. | Mixing takes place in axial direction only |
| B. | Velocity of reaction can be controlled |
| C. | Condition similar to plug flow reactor exists |
| D. | Residence time is constant |
| Answer» C. Condition similar to plug flow reactor exists | |
| 217. |
In a reversible reaction, a catalyst increases the rate of forward reaction__________________? |
| A. | Only |
| B. | To a greater extent than that of the backward reaction |
| C. | And decreases that of the backward reaction |
| D. | And the backward reaction equally |
| Answer» E. | |
| 218. |
In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will________________? |
| A. | Remain the same |
| B. | Be halved |
| C. | Also be doubled |
| D. | Become one fourth |
| Answer» B. Be halved | |
| 219. |
In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants) ? |
| A. | A |
| B. | N |
| C. | A + N |
| D. | A – N |
| Answer» D. A – N | |
| 220. |
In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ? |
| A. | More than |
| B. | Less than |
| C. | Same as |
| D. | Data insufficient; can’t be predicted |
| Answer» D. Data insufficient; can’t be predicted | |
| 221. |
In a CSTR _______________ varies with time ? |
| A. | Reaction rate |
| B. | Concentration |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» E. | |
| 222. |
In a continuous flow stirred tank reactor, the composition of the exit stream_________________? |
| A. | Is same as that in the reactor |
| B. | Is different than that in the reactor |
| C. | Depends upon the flow rate of inlet stream |
| D. | None of these |
| Answer» B. Is different than that in the reactor | |
| 223. |
In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2, the yield of B increases with the____________________? |
| A. | Increase of temperature |
| B. | Decrease of temperature |
| C. | Increase in initial concentration of A |
| D. | Decrease in initial concentration of A |
| Answer» B. Decrease of temperature | |
| 224. |
In a chemical reaction as shown in the bellow figure, it is observed that the (i) Rate of formation of ‘P’ is doubled on doubling the concentration of ‘X’ (ii) Rate of formation of ‘P’ is quadrupled on doubling the concentration of ‘Y’ (iii) Doubling the concentration of ‘Z’ does not affect the rate of formation of ‘P’ What is the order of the above chemical reaction ? |
| A. | Zeroth order |
| B. | First order |
| C. | Second order |
| D. | Third order |
| Answer» E. | |
| 225. |
In a chemical reaction, _____________________ are conserved? |
| A. | Ions |
| B. | Masses |
| C. | Atoms |
| D. | Both B. & C. |
| Answer» E. | |
| 226. |
In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant)_____________________? |
| A. | CA |
| B. | CA2 |
| C. | CA3 |
| D. | CA4 |
| Answer» C. CA3 | |
| 227. |
If Thiele modulus is ________________, then the pore diffusion resistance in a catalyst may be considered as negligible? |
| A. | 0 |
| B. | ∞ |
| C. | < 0.5 |
| D. | > 0.5 |
| Answer» D. > 0.5 | |
| 228. |
If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 229. |
If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is _______________? |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Three |
| Answer» C. Two | |
| 230. |
If the rate of a chemical reaction becomes slower at a given temperature, then the__________________? |
| A. | Initial concentration of the reactants remains constant |
| B. | Free energy of activation is lower |
| C. | Entropy changes |
| D. | Free energy of activation is higher |
| Answer» E. | |
| 231. |
If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to___________________? |
| A. | The intrinsic activation energy E |
| B. | (E + ED) where ED is activation due to diffusion |
| C. | (E + ED)/2 |
| D. | ED/2 |
| Answer» E. | |
| 232. |
‘If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process’. The diffusivity under this condition is called ‘Knudsen diffusivity’, which is affected by the_____________________? |
| A. | Pressure |
| B. | Temperature |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. & B. | |
| 233. |
If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst___________________? |
| A. | Porosity is very important |
| B. | Porosity is of less importance |
| C. | Internal surface area is utilised efficiently |
| D. | None of these |
| Answer» C. Internal surface area is utilised efficiently | |
| 234. |
If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ? |
| A. | t ∝ 1/an |
| B. | t ∝ 1/an – 1 |
| C. | t ∝ 1/an + 1 |
| D. | t ∝ an |
| Answer» C. t ∝ 1/an + 1 | |
| 235. |
If ‘n’ is the order of reaction, then unit of rate constant is _________________? |
| A. | 1/(time)(concentration)n – 1 |
| B. | (Time)-1 (concentration)n – 1 |
| C. | (Time)n – 1 (concentration) |
| D. | None of these |
| Answer» B. (Time)-1 (concentration)n – 1 | |
| 236. |
If in the gaseous phase reaction, N2O4 ⇌ 2NO2, x is the part of N2O4 which dissociates, then the number of molecules at equilibrium will be___________________? |
| A. | (1 + x) |
| B. | (1 – x) |
| C. | (1 + x)2 |
| D. | (1 – x)2 |
| Answer» B. (1 – x) | |
| 237. |
If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chatelier’s principle)? |
| A. | Decreases |
| B. | Increases |
| C. | Remains unaltered |
| D. | Changes unpredictably |
| Answer» B. Increases | |
| 238. |
If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to__________________? |
| A. | (CA/2)n |
| B. | (½)n CA |
| C. | (CA/2)1/n |
| D. | (CA)1/2n |
| Answer» C. (CA/2)1/n | |
| 239. |
If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the ________________ diffusion? |
| A. | Film |
| B. | Ash layer |
| C. | Pore |
| D. | None of these |
| Answer» B. Ash layer | |
| 240. |
If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is_______________________? |
| A. | Not feasible |
| B. | Just feasible |
| C. | Very much feasible |
| D. | Unpredictable as ΔG is no measure of feasibility of a reaction |
| Answer» D. Unpredictable as ΔG is no measure of feasibility of a reaction | |
| 241. |
Holding time for flow reactors is _______________ the space time, for constant fluid density ? |
| A. | Double |
| B. | Triple |
| C. | Equal to |
| D. | None of these |
| Answer» D. None of these | |
| 242. |
Higher free energy of activation of a chemical reaction (at a given temperature) implies ____________________? |
| A. | Slower rate of reaction |
| B. | Higher rate of reaction |
| C. | Higher equilibrium conversion |
| D. | Both B. and C. |
| Answer» B. Higher rate of reaction | |
| 243. |
Helium-mercury method is used for the measurement of the ________________ of the catalyst? |
| A. | Surface area |
| B. | Porosity |
| C. | Pore volume |
| D. | Both B. & C. |
| Answer» E. | |
| 244. |
Helium-mercury method can be used to determine the _____________ of the catalyst particle? |
| A. | Pore volume |
| B. | Solid density |
| C. | Porosity |
| D. | All A., B., & C. |
| Answer» E. | |
| 245. |
Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is _____________ minutes? |
| A. | 18 |
| B. | 24 |
| C. | 6 |
| D. | 12 |
| Answer» C. 6 | |
| 246. |
Half life period of a first order irreversible reaction A → B is ______________________? |
| A. | k/2 |
| B. | ln k/2 |
| C. | ln 2/k |
| D. | ln 0.5/k |
| Answer» D. ln 0.5/k | |
| 247. |
Half life period of a chemical reaction is_________________? |
| A. | The time required to reduce the concentration of the reacting substance to half its initial value |
| B. | Half of the space time of a reaction |
| C. | Half of the residence time of a reaction |
| D. | None of these |
| Answer» B. Half of the space time of a reaction | |
| 248. |
Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of _______________ order? |
| A. | First |
| B. | Zero |
| C. | Second |
| D. | Third |
| Answer» D. Third | |
| 249. |
Half-life period for a first order reaction is _____________ the initial concentration of the reactant? |
| A. | Directly proportional to |
| B. | Inversely proportional to |
| C. | Independent of |
| D. | None of these |
| Answer» D. None of these | |
| 250. |
Given, 3H2 + CO = CH4 + H2O, KP = 101.84 and, 4H2 + CO2 = CH4 + 2H2O, KP = 101.17 the KP for the reaction CO + H2O = CO2 + H2 is __________________? |
| A. | 103.01 |
| B. | 10-0.67 |
| C. | 10-3.01 |
| D. | 100.67 |
| Answer» E. | |