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MCQOPTIONS
This section includes 1443 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1001. |
A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length |
| A. | decreases. |
| B. | increases. |
| C. | is at the highest allowable temperature throughout. |
| D. | first increases and then decreases. |
| Answer» D. first increases and then decreases. | |
| 1002. |
The dimensions of rate constant for reaction 3A B are (l/gm mole)/min. Therefore the reaction order is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 1003. |
The conversion for a second order, irreversible reaction (constant volume), , in batch mode is given by |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 1004. |
The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be __________ times. |
| A. | 4 |
| B. | 16 |
| C. | 8 |
| D. | 2 |
| Answer» C. 8 | |
| 1005. |
Given, 3H2 + CO = CH4 + H2O, KP = 101.84 and, 4H2 + CO2 = CH4 + 2H2O, KP = 101.17the KP for the reaction CO + H2O = CO2 + H2 is |
| A. | 103.01 |
| B. | 10-0.67 |
| C. | 10-3.01 |
| D. | l00.67 |
| Answer» E. | |
| 1006. |
If CA is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to |
| A. | |
| B. | |
| C. | |
| D. | (CA)1/2n |
| Answer» C. | |
| 1007. |
For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single |
| A. | CSTR of volume V |
| B. | PFR of volume V |
| C. | CSTR of volume V/X |
| D. | PFR of volume V/X |
| Answer» C. CSTR of volume V/X | |
| 1008. |
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 | |
| 1009. |
'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. | |
| 1010. |
The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called |
| A. | a ferment or an enzyme |
| B. | haemoglobin |
| C. | fungi |
| D. | none of these |
| Answer» D. none of these | |
| 1011. |
__________ 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 | |
| 1012. |
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 | |
| 1013. |
For a homogeneous reaction of nth order, the dimension of the rate constant is given by |
| A. | l/(time)n |
| B. | (concentration)1 - n/(time) |
| C. | (concentration)n - 1/(time) |
| D. | none of these |
| Answer» C. (concentration)n - 1/(time) | |
| 1014. |
The point selectivity of the product 'Y' in the reaction, is equal to |
| A. | K1/K2 |
| B. | K2/K1 |
| C. | K1-K2 |
| D. | K2-K1 |
| Answer» B. K2/K1 | |
| 1015. |
In which of the following reactions, thee-quilibrium 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 | |
| 1016. |
With increase in temperature, the rate constant obeying Arhenious equation |
| A. | increases. |
| B. | decreases. |
| C. | decreases exponentially. |
| D. | can either increase or decrease ; depends on the frequency factor. |
| Answer» D. can either increase or decrease ; depends on the frequency factor. | |
| 1017. |
With increase in K2/K1 in case of a unimolecular type elementary reactions, the fractional yield of 'R' in mixed reactor (for a given conversion of 'A') |
| A. | decreases |
| B. | increases |
| C. | increases linearly |
| D. | remains same |
| Answer» B. increases | |
| 1018. |
With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion) |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | increases linearly |
| Answer» B. decreases | |
| 1019. |
The dispersion number of perfect mixed flow is |
| A. | 0 |
| B. | > 150 |
| C. | ‚àû |
| D. | < 2100 |
| Answer» D. < 2100 | |
| 1020. |
A consecutive reaction, , is characterised by |
| A. | maxima in the concentration of A. |
| B. | maxima in the concentration of B. |
| C. | maxima in the concentration of C. |
| D. | high exothermicity. |
| Answer» C. maxima in the concentration of C. | |
| 1021. |
The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step.) |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» E. | |
| 1022. |
The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from |
| A. | l.0 to 10-8 |
| B. | l.l.to 102 |
| C. | 0.1 to 0.9 |
| D. | none of these |
| Answer» B. l.l.to 102 | |
| 1023. |
Which of the following factors control the deactivation of a porous catalyst pellet ? |
| A. | Decay reactions. |
| B. | Pore diffusion. |
| C. | Form of surface attack by poison. |
| D. | All (a), (b) and (c). |
| Answer» E. | |
| 1024. |
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to |
| A. | lose a proton |
| B. | gain a proton |
| C. | gain an electron |
| D. | none of these |
| Answer» C. gain an electron | |
| 1025. |
The rate of the chemical reaction A B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction ? |
| A. | 0.5 |
| B. | 1 |
| C. | 0 |
| D. | 2 |
| Answer» C. 0 | |
| 1026. |
A photochemical reaction is |
| A. | accompanied with emission of light. |
| B. | catalysed by light. |
| C. | initiated by light. |
| D. | all (a), (b) & (c). |
| Answer» D. all (a), (b) & (c). | |
| 1027. |
In a chemical reaction , 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. | |
| 1028. |
What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on ? |
| A. | Litre/mole.second |
| B. | Moles/litre.second |
| C. | Litre/mole |
| D. | Litre/second |
| Answer» B. Moles/litre.second | |
| 1029. |
The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is |
| A. | 8987°K |
| B. | 9210°K |
| C. | 8764°K |
| D. | 8621°K |
| Answer» C. 8764¬∞K | |
| 1030. |
For the irreversible elementary reactions in parallel viz , the rate of disappearance of 'X' is equal to |
| A. | CA(K1+K2) |
| B. | CA(K1 + K2)/2 |
| C. | CA . K1/2 |
| D. | CA . K2/2 |
| Answer» B. CA(K1 + K2)/2 | |
| 1031. |
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. | |
| 1032. |
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 . |
| 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. | |
| 1033. |
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by |
| A. | keff = k + kg |
| B. | keff = (k+ kg)/2 |
| C. | keff = (kkg)1/2 |
| D. | |
| Answer» E. | |
| 1034. |
Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an __________ reaction. |
| A. | elementary |
| B. | parallel |
| C. | consecutive |
| D. | none of these |
| Answer» D. none of these | |
| 1035. |
The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy. |
| A. | activation |
| B. | potential |
| C. | binding |
| D. | threshold |
| Answer» B. potential | |
| 1036. |
The reaction between oxygen and organic material is a/an __________ reaction. |
| A. | exothermic |
| B. | endothermic |
| C. | biochemical |
| D. | photochemical |
| Answer» B. endothermic | |
| 1037. |
At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.CH4(g) + H2O(g) CO(g) + 3H2(g), CO(g) + H2O(g) CO2(g) + H2(g)CH4(g) + 2H2O(g) CO2(g) + 4H2(g)Then K1, K2 and K3 are related as: |
| A. | K3 = K1.K2 |
| B. | K3 = (K1.K2)0.5 |
| C. | K3(K1+K2)/2 |
| D. | K3 = (K1.K2)2 |
| Answer» B. K3 = (K1.K2)0.5 | |
| 1038. |
Arhenious equation shows the variation of __________ with temperature. |
| A. | reaction rate |
| B. | rate constant |
| C. | energy of activation |
| D. | frequency factor |
| Answer» C. energy of activation | |
| 1039. |
The conversion for a first order liquid phase reaction. A B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be |
| A. | 60 |
| B. | 75 |
| C. | 90 |
| D. | 100 |
| Answer» C. 90 | |
| 1040. |
Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ? |
| A. | Ash resistance. |
| B. | Gas film and pore surface diffusion resistances for reactants. |
| C. | Surface phenomenon resistance. |
| D. | Gas film and pore surface diffusion resistances for products. |
| Answer» B. Gas film and pore surface diffusion resistances for reactants. | |
| 1041. |
What is the order of a chemical reaction, , if the rate of formation of 'C', increases by a factor of 2.82 on doubling the concentration of 'A' and increases by a factor of 9 on trebling the concentration of 'B'? |
| A. | 43503 |
| B. | 43562 |
| C. | 43501 |
| D. | 43560 |
| Answer» B. 43562 | |
| 1042. |
In a consecutive reaction system 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. | |
| 1043. |
The order of the reaction, , is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 1044. |
Which of the following is the most suitable for very high pressure gas phase reaction ? |
| A. | Batch reactor |
| B. | Tubular flow reactor |
| C. | Stirred tank reactor |
| D. | Fluidised bed reactor |
| Answer» C. Stirred tank reactor | |
| 1045. |
The following half life data are available for the irreversible liquid phase reaction A products.The overall order of reaction is |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» D. 2 | |
| 1046. |
For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption. |
| A. | physical |
| B. | chemical |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) and (b) | |
| 1047. |
The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 1048. |
An isothermal aqueous phase reversible reaction, P R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is |
| A. | 0.8 |
| B. | 1.33 |
| C. | 1.6 |
| D. | 2.67 |
| Answer» D. 2.67 | |
| 1049. |
For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction. |
| A. | XA = k . t |
| B. | |
| C. | #NAME? |
| D. | εA . ln (1 - XA) = k . t |
| Answer» C. #NAME? | |
| 1050. |
The minimum energy required to allow a chemical reaction to proceed is termed as the 'threshold energy '. Chemical reaction with low activation energy are |
| A. | always irreversible. |
| B. | insensitive to temperature changes. |
| C. | mostly irreversible. |
| D. | highly temperature sensitive. |
| Answer» C. mostly irreversible. | |