chemical engineering chemical reaction MCQs – Page 8

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 Review each marked answer and report any item that may be outdated or unclear.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

141. If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the ________________ diffusion?
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A. Ash layer

B. Film

C. Pore

D. None of these

142. For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?
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A. Diffusion through ash layer

B. Chemical reaction

C. Film diffusion

D. Either A., B. or C.

143. In a zero order reaction, reactants concentration does not change with time and the_________________?
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A. Time for completion of the reaction is independent of the initial concentration

B. Reaction rate is trebled when the initial concentration is trebled

C. Time for half change is half the time taken for completion of the reaction

D. Time for half change is independent of the initial concentration

144. The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by________________?
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A. dXA/dt = k1 (1 XA)2 (1 + 2XA)

B. dXA/dt = k1 (1 XA)/(1 + XA)

C. dXA/dt = k1 (1 XA)

D. dXA/dt = k1 (1 XA) (1 + 0.5XA)

145. 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 __________________?
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A. 103.01

B. 10-3.01

C. 100.67

D. 10-0.67

146. Which of the following is used for calcination of limestone and dolomite in industrial practice?
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A. Moving bed reactor

B. None of these

C. Fixed bed reactor

D. Fluidised bed reactor

147. With an increase in pressure in gaseous phase chemical reactions, the fractional conversion ______________ when the number of moles decreases?
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A. Unpredictable from the data

B. Remain unaffected

C. Increases

D. Decreases

148. 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 __________________?
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A. 9210K

B. 8987K

C. 8764K

D. 8621K

149. Catalyst is a substance, which ________________ chemical reaction?
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A. Alters the value of equilibrium constant in a reversible

B. Decreases the speed of a

C. Can either increase or decrease the speed of a

D. Increases the speed of a

150. In an ideal P.F.R. at steady state conditions ___________________?
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A. There is no lateral mixing of fluid

B. There may be diffusion along the flow path

C. The conversion of the reactant varies from point to point along a flow path

D. The composition of reactants remains constant along a flow path

151. The rate of reaction does not decrease appreciably as the reaction proceeds in case of ______________ reactions?
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A. Autothermal

B. Endothermic

C. Exothermic

D. Autocatalytic

152. Oil is hydrogenated using nickel catalyst in a __________________ reactor?
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A. Fluidised bed

B. Slurry

C. Batch

D. Fixed bed

153. 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______________________?
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A. 2-Jan

B. 5-Jan

C. 1/3

D. 4-Jan

154. Fractional conversion _____________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ? 2NH3?
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A. Decreases

B. Unpredictable from the data

C. Remains unchanged

D. Increases

155. Photo-chemical reactions occur in presence of ___________________?
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A. Sunlight

B. Solid catalysts

C. Darkness

D. Monochromatic radiation only

156. A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are_____________________?
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A. None of these

B. Equal in size

C. Of such size that the ratio of their volumes is < 5

D. Of different sizes

157. What is the order of chemical reaction as shown in the bellow figure, if it is found that the reaction rate doubles on doubling the concentration of B and also the reaction rate doubles when the concentrations of both A & B were doubled and quadrupled when the concentrations of both B & C were doubled ?
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A. 2

B. 1

C. 4

D. 3

158. The rate constant of a chemical reaction increases by increasing the______________________?
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A. Temperature

B. Pressure

C. Reactants concentration

D. None of these

159. The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is ?
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A. 0.425

B. 0.875

C. Data insufficient to calculate

D. 0.5

160. Rate of an autocatalytic chemical reaction is a function of ___________________?
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A. Temperature only

B. All A., B. and C.

C. Pressure only

D. Composition only

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