1. Which of the following is an autocatalytic reaction?

2. Which of the following is not endothermic in nature?

3. For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.

4. For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

5. The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a ‘tanks in series model’ comprising of ‘m’ tanks is equal to

6. Reactions with high activation energy are

7. The minimum energy required to allow a chemical reaction to proceed is termed as the ‘threshold energy ‘. Chemical reaction with low activation energy are

8. In a semi-batch reactor,

9. Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the

10. 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

11. The energy of activation of a chemical reaction

12. Backmixing is most predominant in

13. Pick out the wrong statement.

14. Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes.

15. The reaction between oxygen and organic material is a/an __________ reaction.

16. Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

17. A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m³ and volumetric flow rate 1m³ /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m³ . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m³ , the volume of the mixed flow reactor should be increased by a factor of

18. The decomposition of A into B is represented by the exothermic reaction, A ⇋ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction.

19. A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.

20. The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.

21. Pick out the wrong statement

22. The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.

23. For a first order reaction carried out in a plug flow reactor, the space time is

24. When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.

25. A catalyst loses its activity due to

26. Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?

27. What is the dispersion number for a plug flow reactor?

28. __________ resistance is not involved in the combustion of a carbon particle.

29. Pick out the wrong statement.

30. The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.

31. Which of the following is used for calcination of limestone and dolomite in industrial practice?

32. The reactions of high molecularity are rare, because

33. Molecularity of a reaction

34. A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m³ ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min⁻¹ ; (ΔH) = – 40kJ/mole; ρ = 1000kg/m³ CP = 4 J/gm.°C ; q = 10⁻³ m³/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is

35. reactant and product streams). The amount of heat to be removed is

36. In an exothermic reaction, the energy of the reacting substances as compared to that of products is

37. Reaction rate of a first order reaction, which is half completed in 23 minutes will be

38. The effect of increasing pressure on the gaseous equilibrium of the reaction 2X+3Y ⇋ 3X+2Y indicates that

39. For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of ‘P’ is doubled. If the reaction rate is proportional to Cpn, then what is the value of ‘n’ for this chemical reaction

40. The percent conversion of ethanol in the reactor is

41. Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.

42. Rate constant ‘k’ and absolute temperature ‘T’ are related by collision theory (for bimolecular) as

43. The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is

44. Vegetable oils are hydrogenated in a __________ reactor.

45. Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature?

46. A reaction which is catalysed by a base is catalysed by all substances which have a tendency to

47. In a/an __________ vessel, the fluid enters and leaves following plug flow.

48. In the fluid catalytic cracker (FCC), the cracking reaction is __________ (i) and the regeneration is ____________ (ii)

49. __________ explains the mechanism of catalysis.

50. B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm.

51. Specific rate constant for a second order reaction

52. According to Arhenious equation of temperature dependency of rate constant for an elementary reaction

53. Collision theory gives the rate constant for bimolecular reaction as

54. The vessel dispersion number (D/μL) for plug flow is

55. Enzymes are destroyed, when the

56. A catalyst is said to be a negative catalyst, ifit

57. For a zero order chemical reaction, the

58. The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.

59. From Arhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is

60. Which of the following factors control the deactivation of a porous catalyst pellet?

61. Velocity of a reaction depends upon the

62. Inversion of cane sugar is an example of

63. Most important characteristics of gas-liquid reactors are the

64. The enzyme which can catalyse the conversion of glucose to ethyl alcohol is

65. The irreversible reaction is a special case of reversible reaction, if the

66. Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.

67. 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.

68. A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?

69. For a tubular reactor with space time ‘τ’ and residence time ‘θ’, the following statement holds good.

70. With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be

71. The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is

72. The rate constant of a chemical reaction decreases by decreasing the

73. Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because

74. For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times.

75. The rate constant of a chemical reaction increases by increasing the

76. Knudsen diffusion is directly proportional to

77. 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

78. For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.

79. When a catalyst increases the rate of forward reaction, the value of rate constant

80. In the hydrodealkylation of toluene to benzene, the following reactions occur:C₇H₈ + H₂ → C₆H₆ + CH₄2C₆H₆ ⇋ C₁₂H₁₀ + H₂Toluene 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

81. Half-life period for a first order reaction is __________ the initial concentration of the reactant.

82. What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?

83. Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?

84. Transition state theory gives the rate constant as

85. A plug-flow reactor is characterised by

86. Pick out the correct statement

87. On application of pressure to the equilibrium system, ice ⇋ water; which of the following phenomenon will occur?

88. The excess energy of the reactants required to dissociate into products is known as the __________ energy.

89. Radioactive decay follows __________ order kinetics.

90. __________ is the response curve for a step input signal from a reactor.

91. The conversion in a mixed reactor/accomplishing a reaction A 3R is 50% when gaseous reactant ‘A’ is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.

92. Pick out the wrong statement.

93. Pick out the wrong statement.

94. Pick out the wrong statement.

95. Pick out the wrong statement.

96. In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure?

97. Non-catalytic fluid-solid reactions are represented by __________ model.

98. Which of the following is the most suitable for very high pressure gas phase reaction?

99. Considering the endotheomic dissociation of CaCO₃ in a closed vessel (CaCO₃ ⇋ CaO + CO₂), the pressure of CO₂ increases, if

100. As the chemical reaction proceeds, the rate of reaction

101. Promoter.

102. A balanced chemical reaction equation conforms to the law of

103. 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.

104. In a CSTR __________ varies with time.

105. Batch process is preferred over continuous process, when the

106. Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in

107. In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.

108. Which of the following does not produce a change in the value of rate constant of a reaction?

109. For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.

110. 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.

111. The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is

112. The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises form 10 to 100°C.

113. BET apparatus is used to determine the

114. The sequence in which three CSTR’s of volumes 5, 10 and 15 m³ will be connected in series to obtain the maximum production in a second order irreversible reaction is

115. The order of a chemical reaction is

116. With increase in initial concentration, the fractional conversion of a first order reaction in a given time

117. Pick out the wrong statement:

118. The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.

119. The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.

120. The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the

121. Photo-chemical reactions occur in presence of

122. In an ideal mixed reactor (at steady state), the

123. An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction

124. The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called

125. ‘Unreacted core model’ represents the reaction involving

126. If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to

127. Pick out the wrong statement.

128. Half life period of a chemical reaction is

129. Fluid flow in a real packed bed can be approximated as __________ model.

130. Participation of __________ is involved in the occurrence of a chemical reaction.

131. With decrease in temperature, the equilibrium conversion of a reversible endother- mic reaction

132. 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

133. For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

134. Pick out the wrong statement.

135. A batch reactor suffers from following disadvantage.

136. The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

137. In a zero order reaction, reactants concentration does not change with time and the

138. Pick out the wrong statement.

139. “A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?A. Inner catalyst core of radius R/8 does not participate in reaction.”

140. For series reaction, the relative yield

141. In a reversible reaction, a catalyst increases the rate of forward reaction

142. Shift conversion reaction

143. The following gas phase reactions are carried out isothermally in a CSTR.A → 2R ; r₁ = K₁pA ;K₁ = 20mole/(sec.m³ bar)A → 3S ; r₂ = K₂ pA ;K₂ = 40mole/ (sec.m³ .bar)What is the maximum possible value of FR(mole/sec.) ?

144. When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is

145. Pick out the wrong statement.

146. The effectiveness factor for large value of Thiele modulus (L√(K/D1)) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm²/second)

147. The performance equations for constant density systems are identical for

148. During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the

149. __________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.

150. Space time in flow reactor is

151. Space velocity

152. The residence time distribution of an ideal CSTR is

153. To maximise the formation of R in the simultaneous reactionA + B → R , rR = 2CA0.5.CB2 A + B → S , rS = 1.5 CA . CB We should have

154. The rate constant of a reaction depends on the

155. In case of a __________ reactor, the composition in the reactor and at the exit of the reactor is the same.

156. For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a

157. Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature.

158. The gas phase reaction 2A ⇋ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is

159. The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are

160. From collison theory, the reaction rate constant is proportional to

161. For any reaction, we may write conversion as a function of

162. In flow reactors, the performance equations interrelate the rate of reaction to the

163. The space time is equivalent to the holding time in a steady state mixed reactor for

164. For a heterogeneous catalytic reaction

165. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will

166. The extent of a reaction is

167. The heat of reaction

168. For a homogeneous reaction of nth order, the dimension of the rate constant is given by

169. 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

170. For an autocatalytic reactor, the suitable reactor set up is

171. __________ gas is normally employed in B.E.T.method of finding out the surface area of catalyst.

172. 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

173. When an exothermic reversible reaction is conducted adiabatically, the rate of reaction

174. For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant

175. When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn.

176. Promoter is added to the catalyst to improve its

177. The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called

178. For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to

179. In which of the following reactions, thee-quilibrium will shift to the right, if the total pressure is increased?

180. An example of autothermal reactor operation is

181. The performance of a cascade of CSTR’s can be improved by adding

182. For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is

183. Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.

184. Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.

185. The rate of the reaction, X → Y, quadruples when the concentration of ‘X’ is doubled. The rate expression for the reaction is, r = K Cxn, the value of ‘n’ in this case will be

186. Which of the following is not a chemical step in a fluid solid catalytic reaction?

187. The dispersion number of perfect mixed flow is

188. Sometimes, batch process is preferred over continuous process, when the product

189. For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.

190. 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?

191. Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?

192. The ‘E’ curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt

193. The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line?

194. The reactions with low activation energy are

195. In case of a/an __________ chemical reaction, conversion increases with the rise in temperature.

196. The units of frequency factor in Arhenious equation

197. Pick out the wrong statement.

198. Differential method for analysing the kinetic data is used

199. Integral method for analysing the kinetic data is used

200. In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.

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