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1) 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. 0.80 b. 1.33 c. 1.60 d. 2.67
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2) Which of the following chemical reactions will be favoured by low pressure ? a. 2HI ⇌ H2 + I2 b. N2O2 ⇌ 2NO2 c. N2 + O2 ⇌ 2NO d. None of these
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3) 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 ___________________? a. Blood b. Saliva c. Intestine d. Gland
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4) A balanced chemical reaction equation conforms to the law of________________? a. Conservation of mass b. Avogadro’s hypothesis c. Gaseous volumes d. None of these
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5) Molecularity of a reaction__________________? a. Is always equal to the overall order of reaction b. May not be equal to the order of reaction c. Can’t have a fractional value d. Both B. and C.
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6) A multiple reaction may be classified as a ________________ reaction? a. Consecutive or side b. Parallel or side c. Mixed d. All A., B. and C.
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7) consecutive reaction, as shown in the bellow figure, 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
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8) Slurry reactors are characterised by the_________________? a. Lack of intraparticle diffusion resistance b. Presence of two mobile phases c. Both A. and B. d. Neither A. nor B.
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9) The role of a catalyst in a chemical reaction is to change the__________________? a. Equilibrium constant b. Activation energy c. Final products d. Heat of reaction
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10) The reactions of high molecularity are rare, because________________? a. Of very large activation energy of many bodies b. Of low probability of many body collisions c. Many body collisions are not favoured energetically d. Of requirement of very large concentration for such reactions
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11) Holding time for flow reactors is _______________ the space time, for constant fluid density ? a. Double b. Triple c. Equal to d. None of these
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12) Design of heterogamous catalytic reactor involves consideration of _______________ steps? a. Only chemical b. Only physical c. Both A. & B. d. Neither A. nor B.
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13) 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 rR/rS = (k1/k2). CA a-b ? 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
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14) From Arrhenius 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___________________? a. k cal b. k cal/°K c. °K d. k cal. °K
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15) During manufacture of H2SO4, the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the _____________________? a. Temperature is increased b. Pressure is reduced c. Temperature is increased and pressure is reduced d. Temperature is reduced and pressure is increased
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16) An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will ______________ with decrease in space time? a. Increase b. Increase exponentially c. Decrease d. Remain unchanged
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17) Which of the following is an autocatalytic reaction ? a. Photochemical reactions b. Microbial fermentation reaction c. Enzyme fermentation reaction d. Ammonia synthesis
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18) 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
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19) With increase in temperature, the equilibrium _______________ rises in case of endothermic reaction? a. Constant b. Conversion c. Both A. & B. d. Neither A. nor B.
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20) Reverse reaction in a chemical equilibrium is favoured by the________________? a. Removal of one of the products regularly b. Increase in the concentration of one of the products c. Increase in the concentration of one of the reactants d. None of these
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21) When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only _______________ the true value? a. Twice b. Half c. Equal d. None of these
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22) For a first order chemical reaction, the rate constant_________________? a. Changes on changing the concentration units b. Is not a function of the unit of time c. Has unit of time-1 d. None of these
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23) The rate of forward reaction, at chemical equilibrium is ______________ the rate of backward reaction? a. More than b. Less than c. Equal to d. Either B. or C.
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24) An exothermic reaction takes place in an adiabatic reactor. The product temperature ______________ reactor feed temperature? a. Is always equal to b. Is always greater than c. Is always less than d. May be greater or less than
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25) Which of the following is the most suitable for isothermal operation? a. Batch reactor b. Back-mix reactor c. Plug-flow reactor d. Fixed bed reactor
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26) The rate at which a chemical substance reacts is proportional to its _____________________? a. Active mass b. Molecular weight c. Equivalent weight d. Atomic weight
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27) Sum of the powers of the concentration terms in the rate equation is called the _____________ of the reaction? a. Order b. Overall order c. Molecularity d. None of these
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28) Thermodynamic equilibrium constant in a system is affected by___________________? a. Inerts b. Pressure c. Temperature d. All A., B. & C.
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29) Considering the endothermic dissociation of CaCO3 in a closed vessel (CaCO3 ⇌ CaO + CO2), the pressure of CO2 increases, if____________________? a. A catalyst is added b. The temperature is increased c. An inert gas is pumped keeping the temperature constant d. None of these
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30) Conversion increases with increase in temperature in case of a/an ______________ reaction? a. Autocatalytic b. Irreversible c. Reversible endothermic d. Reversible exothermic
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