chemical engineering chemical reaction MCQs – Page 6

Practise multiple-choice questions from chemical engineering chemical reaction for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical reaction Mcqs
101. The space time is equivalent to the holding time in a steady state mixed reactor for_____________________?
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A. Gas reactions with changing number of moles

B. Non-isothermal gas reaction

C. Variable fluid density systems

D. Constant fluid density systems
102. 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?
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A. 8

B. 2

C. 4

D. 16
103. Inversion of cane sugar is an example of ______________________?
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A. Unimolecular reaction with second order

B. Bimolecular reaction with first order

C. Unimolecular reaction with first order

D. Bimolecular reaction with second order

104. Vegetable oils are hydrogenated in a _______________ reactor?
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A. Plug flow

B. Homogeneous catalytic

C. None of these

D. Slurry
105. Knudsen diffusion is directly proportional to _____________________?
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A. ?T

B. T2

C. T

D. 1/?T

106. If ?G (free energy change) for a chemical reaction is very large and negative, then the reaction is_______________________?
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A. Just feasible

B. Very much feasible

C. Unpredictable as ?G is no measure of feasibility of a reaction

D. Not feasible

107. A non-catalytic chemical reaction of the type as shown in the bellow figure is called a _____________ reaction?
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A. Series-parallel

B. None of these

C. Series

D. Parallel

108. Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?
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A. None of these

B. Freundlich adsorption isotherm

C. Langmuir adsorption isotherm

D. Adsorption isobar
109. A batch reactor is characterised by ____________________?
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A. Variation in reactor volume

B. Constant residence time

C. Very low conversion

D. Variation in extent of reaction and properties of the reaction mixture with time
110. In autocatalytic reactions ?
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A. One of the products acts as a catalyst

B. Catalysts have very high selectivity

C. No catalyst is used

D. One of the reactants acts as a catalyst

111. Limiting reactant in a chemical reaction decides the____________________?
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A. Reaction speed

B. Equilibrium constant

C. Rate constant

D. Conversion
112. With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will________________?
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A. Increase

B. Data in insufficient; cant be predicted

C. Remain same

D. Decrease

113. The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between___________________?
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A. 2-5 %

B. 7-10 %

C. 12-15 %

D. 20-25 %

114. _____________ gas is normally employed in B.E.T. method of finding out the surface area of catalyst?
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A. N2

B. CO2

C. He

D. H2

115. Effectiveness factor of a catalyst pellet is a measure of the _________________ resistance?
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A. Chemical reaction

B. None of these

C. Pore diffusion

D. Gas film

116. What is the maximum possible value of FR(mole/sec.) ?
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A. 2-Jan

B. 2/3

C. 2

D. 3-Jan

117. An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will__________________?
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A. Be more in CSTR than in PFR

B. Be more in PFR than in CSTR

C. Be same in both cases

D. Depend on the temperature

118. The rate constant of a reaction depends on the __________________?
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A. Temperature of the system

B. Time of reaction

C. Extent of reaction

D. Initial concentration of reactants

119. ________________ resistance is not involved in the combustion of a carbon particle?
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A. Chemical reaction

B. Gas film

C. None of these

D. Ash
120. In Langmuir treatment of adsorption,_________________?
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A. the rate of adsorption per site</strong>

B. Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect

C. raction between the adsorbed molecule

D. Whole surface of the catalyst does not have the same activity for adsorption and there is

E. All the adsorption does not take place by the same mechanism

F. Extent of adsorption is more than one complete monomolecular layer on the surface