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1) 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
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2) Exposure of a photographic plate to produce a latent image is an example of _______________ reaction? a. Very slow b. Very fast c. Photochemical d. Both B. and C.
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3) Knudsen diffusion is directly proportional to _____________________? a. T b. √T c. 1/√T d. T2
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4) 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
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5) Mean residence time is equal to the space time, when_________________? a. The feed rate is measured at temperature and pressure in the reactor b. The temperature, pressure and the density of reaction mixture remains constant throughout the reactor c. There is no change in number of moles in gaseous reaction d. All A., B. and C.
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6) The following gas phase reaction is taking place in a plug flow reactor. A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X) ? a. CA = 1.2 CA0 (1 – X)/(1 – 0.33X) b. CA = 1.2 CA0 (1 – X)/(1 – 0.5X) c. CA = 0.83 CA0 (1 – X)/(1 – 0.33X) d. CA = 0.83 CA0 (1 – X)/(1 – 0.5X)
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7) A catalyst in a chemical reaction____________________? a. Decreases the activation energy b. Alters the reaction mechanism c. Increases the frequency of collisions of reacting species d. All A., B. and C.
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8) An irreversible aqueous phase reaction, A + B → P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed? Data: Heat of reaction = – 50 kJ/mole Density of the reacting mixture = 1000kg/m3 Specific heat of reacting mixture = 2kJ/kg.K The above data can be assumed to be independent of temperature and composition? a. 190 b. 290 c. 390 d. 490
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9) The rate expression for a heterogeneous catalytic reaction is given by, – rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) ? a. E b. E + ΔHA c. E + ΔHA – ΔHR) d. ΔHA + ΔHR
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10) Which of the following fixes the volume of a batch reactor for a particular conversion and production rate ? a. Operating conditions (e.g. pressure and temperature) b. Rate constant c. Density of mixture d. None of these
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11) Limiting reactant in a chemical reaction decides the____________________? a. Rate constant b. Conversion c. Reaction speed d. Equilibrium constant
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12) The exit age distribution curve E(t) for an ideal CSTR with the average residence time, η, is given by__________________? a. e-t/η b. e-t/η/η c. 1 – e-t/η d. 1 – (e-t/η/η)
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13) What is the value of ‘n’ if the reaction rate of the chemical reaction A → B, is proportional to CA n and it is found that the reaction rate triples, when the concentration of ‘A’ is increased 9 times ? a. 1/2 b. 1/3 c. 1/9 d. 3
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14) For all positive reaction orders for a particular duty ? a. Mixed reactor is always larger than the plug-flow reactor b. Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order c. Reactor size is independent of the type of flow d. Density variation during reaction affects design
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15) In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes ? a. 2O3 ⇌ 3O2 b. N2 + O2 ⇌ 2NO c. 2NO2 ⇌ N2O4 d. 2SO2 + O2 ⇌ 2SO3
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16) Non-catalytic fluid-solid reactions are represented by _______________ model? a. Continuous reaction b. Unreacted core c. Both A. and B. d. Neither A. and B.
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17) Which of the following holds good for an elementary reaction as shown in the bellow figure ? a. The rate of disappearance of ‘Y’ is equal to the rate of appearance of ‘Z’ b. The rate of disappearance of ‘Y’ is equal to the rate of disappearance of ‘X’ c. Three times the rate of disappearance of ‘X’ is equal to the rate of appearance of ‘Z’ d. The rate of disappearance of ‘X’ is equal to the rate of appearance of ‘Z’
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18) The exit age distribution of fluid leaving a vessel is used to know the__________________? a. Activation energies of a reaction b. Reaction mechanism c. Extent of non-ideal flow in the vessel d. None of these
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19) The equilibrium constant ‘K’ of a chemical reaction depends on_________________? a. Temperature only b. Pressure only c. Temperature and pressure d. Ratio of reactants
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20) With increase in temperature, the rate constant obeying Arrhenius equation____________________? a. Increases b. Decreases c. Decreases exponentially d. Can either increase or decrease; depends on the frequency factor
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21) For a homogeneous reaction of nth order, the dimension of the rate constant is given by_________________? a. 1/(time)n b. (Concentration)1 – n/(time) c. (Concentration)n – 1/(time) d. None of these
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22) A catalyst promoter_________________? a. Improves the activity of a catalyst b. Acts as a catalyst support c. Itself has very high activity d. All A., B. and C.
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23) The vessel dispersion number (D/μL) for plug flow is_________________? a. 0 b. 500 c. 750 d. ∞
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24) The rate constant of a reaction is a function of the ___________________? a. Time of reaction b. Temperature of the system c. Extent of reaction d. Initial concentration of the reactants
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25) Cold shot cooling is only practical when the feed temperature is ______________ than the reaction temperature? a. Higher b. Much higher c. Lower d. Much lower
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26) Autocatalytic reactions are best carried out in a_________________? a. CSTR b. CSTR in series c. Plug flow reactor d. Recycle reactor
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27) Bulk diffusion in catalyst pore _______________ with increase in pressure? a. Increases b. Decreases c. Remains unchanged d. Increases exponentially
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28) For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ? a. 0.253 b. 0.338 c. 0.152 d. 0.637
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29) The extent of a reaction is ___________________? a. Different for reactants and products b. Dimensionless c. Depends on the stoichiometric co-efficient d. All of the above
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30) Arrhenius equation represents graphically the variation between the ______________ and temperature? a. Rate of reaction b. Frequency factor c. Rate constant d. Activation energy
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