Q.1

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

  • equal in size.
  • of different sizes.
  • of such size that the ratio of their volumes is < 5.
  • none of these.
Q.2

With increase in temperature, the equilibrium conversion of a reversible exothermic reaction

  • decreases
  • increases
  • remains unaffected
  • decreases linearily with temperature
Q.3

The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.

  • autocatalytic
  • exothermic
  • endothermic
  • autothermal
Q.4

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

  • continuous reaction
  • unreacted core
  • both (a) and (b)
  • neither (a) and (b)
Q.5

Fluidised bed reactor is characterised by

  • uniformity of temperature.
  • comparatively smaller equipment.
  • very small pressure drop.
  • absence of continuous catalyst regeneration facility.
Q.6

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

  • time
  • temperature
  • concentration
  • all (a), (b) & (c)
Q.7

The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.

  • autocatalytic
  • exothermic
  • endothermic
  • autothermal
Q.8

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

  • time
  • temperature
  • concentration
  • all (a), (b) & (c)
Q.9

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

  • increases
  • remains unchanged
  • decreases
  • unpredictable from the data
Q.10

For a fluidised bed reactor, the most suitable/relevant model is a __________ model.

  • tank in series
  • bubbling bed
  • plug flow
  • none of these
Q.11

Inversion of cane sugar is an example of

  • unimolecular reaction with first order.
  • bimolecular reaction with second order.
  • bimolecular reaction with first order.
  • unimolecular reaction with second order.
Q.12

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

  • increased temperature reduces the activation energy.
  • fraction of molecules having threshold energy increases.
  • collision frequency increases.
  • value of threshold energy decreases.
Q.13

Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes.

  • Strong pore diffusion control and mass transfer not controlling.
  • Both pore diffusion and mass transfer not controlling.
  • Both pore diffusion and mass transfer controlling.
  • Mass transfer controlling.
Q.14

Batch process is preferred over continuous process, when the

  • product yields and quality can not be achieved in continuous process, because of long residence time.
  • sales demand of product is not steady.
  • same equipment can not be used for several processes of the same nature.
  • all (a), (b) & (c)
Q.15

Sum of the powers of the concentration terms in the rate equation is called the __________ of the reaction.

  • order
  • overall order
  • molecularity
  • none of these
Q.16

In case of staged packed bed reactors carrying out exothermic reaction, use

  • high recycle for pure gas.
  • plug flow for dilute liquid requiring no large preheating of feed.
  • cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature.
  • all (a), (b) and (c).
Q.17

For a __________ order chemical reaction, , the half life period is independent of the initial concentration of the reactant A.

  • zero
  • first
  • second
  • third
Q.18

In a CSTR __________ varies with time.

  • reaction rate
  • concentration
  • both (a) & (b)
  • neither (a) nor (b)
Q.19

For all positive reaction orders for a particular duty,

  • mixed reactor is always larger than the plug-flow reactor.
  • ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order.
  • reactor size is independent of the type of flow.
  • density variation during reaction affects design.
Q.20

A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t =The time taken for the exit concentration of the tracer to reach half of its initial value will be

  • 2τ
  • 0.5τ
  • τ/0.693
  • 0.693τ
Q.21

The use of space time is preferred over the mean residence time in the design of a/an

  • batch reactor
  • ideal tubular-flow reactor
  • slurry reactor
  • CSTR
Q.22

Which of the following is not a unit of reaction rate ?

  • Moles for med/(surface of catalyst) (time)
  • Moles formed/volume of reactor) (time)
  • Mole formed/volume of catalyst) (time)
  • None of these
Q.23

Vegetable oils are hydrogenated in a __________ reactor.

  • slurry
  • plug flow
  • homogeneous catalytic
  • none of these
Q.24

Half life period of a chemical reaction is proportional to CA0-1 , if the reaction is of __________ order.

  • first
  • zero
  • second
  • third
Q.25

The heat of reaction

  • depends on the pressure only.
  • depends on the mechanism of reaction only.
  • depends on both pressure and mechanism of reaction.
  • is independent of the mechanism of reaction.
Q.26

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

  • protons
  • neutrons
  • electrons
  • none of these
Q.27

Space time equals the mean residence time

  • when the density of the reaction mixture is constant.
  • for large diameter tubular reactor.
  • for narrow diameter tubular reactor.
  • for CSTR.
Q.28

A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required forconversion of the liquid will be __________ minutes.

  • 4
  • 8
  • 12
  • 16
Q.29

Autocatalytic reactions are best carried out in a

  • CSTR
  • CSTR in series
  • plug flow reactor
  • recycle reactor
Q.30

Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?

  • Langmuir's assumption applies to every adsorbed layer.
  • There is no dynamic equilibrium between successive layer.
  • The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process.
  • none of these.
Q.31

A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required forconversion of the liquid will be __________ minutes.

  • 4
  • 8
  • 12
  • 16
Q.32

As the chemical reaction proceeds, the rate of reaction

  • increases.
  • decreases.
  • remains same.
  • may increase or decrease depending on the type of reaction.
Q.33

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

  • Pressure
  • Temperature
  • Concentration and catalyst
  • None of these.
Q.34

Promoter.

  • initiates a chemical reaction and is a catalyst by itself.
  • atlers the position of equilibrium in a reversible reaction.
  • increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals.
  • all (a), (b) and (c).
Q.35

The value of 'n' for a chemical reaction A B, whose reaction rate is CAn, will be __________ if the rate of the reaction increases by a factor ofwhen the concentration of is doubled.

  • 0
  • 1
  • 2
  • 3
Q.36

Rate constant 'k' and absolute temperature 'T' are related by collision theory (for bimolecular) as

  • k ∝ T1.5
  • k ∝ exp(-E/RT)
  • k ∝ T
  • k ∝ T
Q.37

As the chemical reaction proceeds, the rate of reaction

  • increases.
  • decreases.
  • remains same.
  • may increase or decrease depending on the type of reaction.
Q.38

Promoter.

  • initiates a chemical reaction and is a catalyst by itself.
  • atlers the position of equilibrium in a reversible reaction.
  • increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals.
  • all (a), (b) and (c).
Q.39

The sequence in which three CSTR's of volumesandm3 will be connected in series to obtain the maximum production in a second order irreversible reaction is

  • 15, 10, 5
  • 5, 10, 15
  • 10, 5, 15
  • 10, 15, 5
Q.40

The preferred reacting system for oxidation of o-xylene to phthalic anhydride is

  • jacketted liquid phase CSTR.
  • jacketted steam heated multitubular reactor.
  • multitubular reactor with cooling.
  • multistage multitubular reactor with interstage cooling.
Q.41

Inversion of cane sugar is an example of

  • unimolecular reaction with first order.
  • bimolecular reaction with second order.
  • bimolecular reaction with first order.
  • unimolecular reaction with second order.
Q.42

What is the value of 'n' if the reaction rate of the chemical reaction A B, is proportional to CAn and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times ?

  • 1/2
  • 1/3
  • 1/9
  • 3
Q.43

Pick out the wrong statement.

  • Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition.
  • Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction.
  • Activation energy for a reaction is obtained from the intercept of the Ar-rhenious plot.
  • Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction.
Q.44

Pick out the wrong statement.

  • A catalyst does not alter the final position of equilibrium in a reversible reaction.
  • A catalyst initiates a reaction.
  • A catalyst is specific in reaction.
  • A catalyst remains unchanged in chemical composition at the end the reaction.
Q.45

The irreversible reaction, X Y, is the special case of the reversible reaction, X Y, in which the

  • equilibrium constant is infinite.
  • fractional conversion of 'A' at equilibrium is unity.
  • concentration of 'A' at equilibrium is zero.
  • all (a), (b) and (c).
Q.46

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

  • 2/3
  • 5/8
  • 1/3
  • 3/8
Q.47

For a __________ order chemical reaction, , the half life period is independent of the initial concentration of the reactant A.

  • zero
  • first
  • second
  • third
Q.48

The rate equation for the reaction represented by, is given by - rx = K1 . Cx/(1 + K2 Cx). At high value of Cx (i.e.., K2Cx > > 1), the order of the reaction and the rate constant are respectively

  • zero order & K1/K2
  • zero order & K1
  • first order & K1
  • first order & K1/K2
Q.49

The irreversible reaction, X Y, is the special case of the reversible reaction, X Y, in which the

  • equilibrium constant is infinite.
  • fractional conversion of 'A' at equilibrium is unity.
  • concentration of 'A' at equilibrium is zero.
  • all (a), (b) and (c).
Q.50

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

  • Operating conditions (e.g. pressure and temperature)
  • Rate constant
  • Density of mixture
  • None of these
0 h : 0 m : 1 s