CRE Flashcards
Which of the following will give maximum gas conversion?
Semi-fluidised bed reactor.
__________ explains the mechanism of catalysis.
Activated complex theory
From among the following, choose one which is not an exothermic process.
Catalytic cracking
The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is
2
A catalyst
lowers the activation energy of reacting molecules.
What is the order of a chemical reaction, https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/450-191-1.png , if the rate of formation of ‘C’, increases by a factor of 2.82 on doubling the concentration of ‘A’ and increases by a factor of 9 on trebling the concentration of ‘B’?
45475
For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.
fluidised bed reactor followed by a fixed
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.
16
The single parameter model proposed for describing non-ideal flow is the __________ model.
both (a) & (b)
A first order reaction requires two equal sized CSTR. The conversion is
more when they are connected in series.
In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.
1000
The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is
backmix reactor
Pick out the wrong statement pertaining to space velocity of flow reactors.
The space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor.
A reactor is generally termed as an autoclave, when it is a
high pressure batch reactor.
6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant ?
0.95
The rate constant of a chemical reaction decreases by decreasing the
temperature
Reaction rate equation for the reaction, https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/448-153-1.png . If S at is present in large excess, what is the order of this reaction?
one
Rate of a gaseous phase reaction is given by, https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/460-311-1.png . The unit of rate constant is
(atm)-1.(hr)-1
__________ is the response curve for a step input signal from a reactor.
S-curve
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
temperature
Which of the following is the most suitable for very high pressure gas phase reaction ?
Tubular flow reactor
The reaction between oxygen and organic material is a/an __________ reaction.
exothermic
With decrease in temperature, the equilibrium conversion of a reversible endother-mic reaction
decreases
In an exothermic chemical reaction, the reactants compared to the products have
more energy
For a reaction of the type, https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/458-286-1.png , the rate of reaction (- rx) is given by
K1CV - K2CX
In a consecutive reaction system https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/446-134-1.png when E1 is much greater than E2, the yield of B increases with the
increase of temperature.
A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length
is at the highest allowable temperature throughout.
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
9210°K
A batch reactor is suitable for
liquid phase reactions.
For a heterogeneous catalytic reaction
free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction.
The increase in the rate of reaction with temperature is due to
decrease in activation energy.
A catalyst loses its activity due to
all (a), (b) and (c).
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.
any
Specific rate constant for a second order reaction
both (b) and (c).
For the irreversible elementary reactions in parallel viz https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/455-247-1.png , the rate of disappearance of ‘X’ is equal to
CA(K1+K2)
For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction.
CAo/(1+εAXA)(dXA/dt) = k
For a zero order chemical reaction, the
all (a), (b) and (c).
BET apparatus
none of these.
Radioactive decay follows __________ order kinetics.
first
The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.
activation
For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.
chemical
Pick out the correct statement.
A catalyst lowers the activation energy of the reacting molecules.
The dimensions of rate constant for reaction 3A –> B are (l/gm mole)/min. Therefore the reaction order is
2
Pick out the correct statement
Reactions with high activation energies are very temperature sensitive.
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
2
Sulphuric acid is used as a catalyst in the
alkylation of hydrocarbons.
Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 <->2NH3.
increases
Pick out the wrong statement.
Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
The reason why a catalyst increases the rate of reaction is that, it
decreases the energy barrier for reaction.
A first order irreversible reaction, A –> B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.
conversion in both will be the same but concentrations will be different
When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is
1
In an ideal tubular-flow reactor
all (a), (b) and (c).
At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?
2.5
__________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.
Chemical reaction
An autothermal reactor is
completely self-supporting in its thermal energy requirements.
The rate constant of a first order reaction depends on the
temperature.
A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
autocatalytic
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
1
Which of the following will favour the reverse reaction in a chemical equilibrium reaction ?
Increasing the concentration of one or more of the products.
Conversion increases with increase in temperature in case of a an __________ reaction.
reversible endothermic
Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as
1/DE = 1/DN + 1/DK
A photochemical reaction is __________ light.
initiated by
Pick out the wrong statement.
In a continuous flow reactor, uniform concentration can not be maintained throughout the vessel even in a well agitated system.
In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.
non-adiabatic
Unreacted core model’ represents the reaction involving
roasting of sulphide ores.
For a vapour phase catalytic reaction (A + B –> P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs).
https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/475-472-1.png
If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.
film
The units of frequency factor in Arhenious equation
are the same as those of the rate constant.
Which of the following is not a chemical step in a fluid solid catalytic reaction ?
None of these
For a series of reactions https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/473-457-1.png having k1 «_space;k2, the reaction system can be approximated as
https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/476-478-1u.png
At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.
CH4(g) + H2O(g) CO(g) + 3H2(g),
CO(g) + H2O(g) CO2(g) + H2(g)
CH4(g) + 2H2O(g) CO2(g) + 4H2(g)
Then K1, K2 and K3 are related as:
K3 = K1.K2
In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.
auto catalytic
For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor.
stirred tank
What is the Thiele modulus of the solid catalysed first order reaction, https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/448-154-1.png , if the pore diffusion offers negligible resistance to reaction ?
< 0.5
B.E.T. method can be used to determine the __________ of a porous catalyst.
surface area
Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is
1
Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature?
Time
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
both (a) and (b).
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.
16
In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will
remain the same
The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.
remains unaffected
The rate constant of a chemical reaction increases by increasing the
temperature
The catalytic activity of enzymes is due to their capacity to lower the __________ energy.
activation
A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
Either of the arrangement (a) or (b) will give the same yield.
Pick out the correct statement.
A lower temperature favours the reaction of lower activation energy.
The effect of increasing pressure on the gaseous equilibrium of the reaction 2X+3Y <–>3X+2Y indicates that
pressure has no effect.
If in the gaseous phase reaction, N2O4 <–> 2NO2, x is the part of N2O4 which dissociates, then the number of molecules at equilibrium will be
(1 + x)
A batch reactor is characterised by
variation in extent of reaction and properties of the reaction mixture with time.
When a catalyst increases the rate of forward reaction, the value of rate constant
increases
Rate determining step in a reaction consisting of a number of steps in series is the __________ step.
slowest
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.
512
A catalyst in a chemical reaction __________ free energy change in the reaction.
either (a) or (b); depends on the type of catalyst
Signal normally used to study non-ideal flow by stimulus response technique is __________ input.
both (a) & (b)
When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield.
equals
The half life period of a first order reaction is
independent on initial concentration of the reactants.
The catalyst in a second order reversible reaction increases the rate of the forward reaction
and backward reaction equally.
Catalyst carriers
provide large surface area with a small amount of active material.
For the liquid phase zero order irreversible reaction A–> B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1 . What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR.
0.6
A high space velocity means that a given
both (a) and (b).
In flow reactors, the performance equations interrelate the rate of reaction to the
all (a), (b) and (c).
Space velocity
all (a), (b) and (c)
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 ?
1
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to
gain a proton
For a homogeneous reaction of nth order, the dimension of the rate constant is given by
(concentration)^1 - n/(time)
The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A–>R, is
-0.5
The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
autocatalytic
A typical example of an exothermic reversible reaction conducted at high pressure in industry is
dehydration of ethanol.
Study of chemical kinetics is the easiest in the case of __________ reactions.
irreversible
In autocatalytic reactions,
one of the products acts as a catalyst.
Semibatch reactor is preferred, when a/an
all (a), (b), and (c).
Exposure of a photographic plate to produce a latent image is an example of __________ reaction.
both (b) and (c)
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
∞
Helium-mercury method is used for the measurement of the __________ of the catalyst.
both (b) & (c).
What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?
first
Pick out the wrong statement.
The order and molecularity of a complex reaction may not be the same.
The rate at which a chemical substance reacts is proportional to its
active mass
The exit age distribution of a fluid leaving a vessel (denoted by E) is used to study the extent of non-ideal flow in the vessel. The value of https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/467-387-1.png is
1
A plug-flow reactor is characterised by
presence of lateral mixing.
Three plug flow reactors (PFR’s) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/468-389-1.png If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be __________ tons/hr.
100
For a tubular reactor with space time ‘τ’ and residence time ‘θ’, the following statement holds good.
τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant.
Rate of an autocatalytic chemical reaction is a function of
all (a), (b) and (c).
Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?
Adsorption isobar
For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by
none of the above
Fluid flow in a real packed bed can be approximated as __________ model.
dispersion
For series reaction, the relative yield
both (a) and (c) hold good.
The ‘E’ curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt
at the outlet
To maximise the formation of R in the simultaneous reaction
A + B –> R , rR = 2CA^0.5.CB^2
A + B –> S , rS = 1.5 CA . CB
We should have
low CA, high CB
A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to
lose a proton.
A stirred tank reactor compared to tubular-flow reactor provides
all (a), (b) and (c)
A chemical reaction, A –>3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is
1
A catalyst inhibitor
all(a), (b) and (c).
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a __________ reaction.
catalytic homogenous
If the rate of a chemical reaction becomes slower at a given temperature, then the
free energy of activation is higher.
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 ?
XA Vs . τ
The rate of the reaction, X–> Y, quadruples when the concentration of ‘X’ is doubled. The rate expression for the reaction is, r = K Cx^n, the value of ‘n’ in this case will be
2
The value of steric factor ‘P’ in the equation k = PZe^E/RT usually ranges from
1.0 to 10^-8
For a zero order reaction, the concentration of product increases with the
increase of reaction time.
Pick out the wrong statement.
A batch reactor can not be used to study the kinetics of catalytic reaction.
Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
pore diffusion
The rate expression for a heterogenous 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»_space; (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)
E + ΔHA - ΔHR)
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
10^0.67
Differential method for analysing the kinetic data is used
for testing complicated mechanisms.
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is
same
The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.
elementary
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by
1/keff = 1/k + 1/kg
Arrhenious equation represents graphically the variation between the __________ and temperature.
rate constant
__________ catalytic reaction is involved in the thermal cracking of gas oil.
Homogeneous
Variables affecting the rate of homogeneous reactions are
pressure, temperature and composition.
A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
equal to or more than
Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction?
Ash resistance.
If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is
one
A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A–>B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be
10°C
If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to
(1/2)^n.CA
A photochemical reaction is
initiated by light.
The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g)–> C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step.)
https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/470-420-4.png
The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the
space time for each parallel line is same.
A catalyst is said to be a negative catalyst, ifit
retards the rate of reaction.
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.
chemical reaction
Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene :95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether :2.5 kmole/hr. The reactions occuring can be represented by:
C2H5OH C2H4 + H2O
2C2H5OH C2H5 - O - C2H5 + H2O
The percent conversion of ethanol in the reactor is
100
The conversion for a second order, irreversible reaction (constant volume), https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/475-469-1.png , in batch mode is given by
https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/475-469-3.png
Pick out the wrong statement.
When the reaction rate is independent of temperature, the reaction is said to be of zero order.
A backmix reactor
is same as ideal stirred tank reactor.
Rate of a chemical reaction is not influenced by the
number of molecules of reactants taking part in a reaction
Pick out the wrong statement:
The residence time for all the elements of fluid in case of a P.F.R. need not be same.
The reaction A B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3 is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k)is (Data: Heat of reaction at 298 K = - 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature))
600
Which of the following is not a theory of homogeneous reaction?
None of these
A first order homogeneous reaction of the type X Y Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time? https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/446-129-1.png
III, II, I
In a semi-batch reactor,
velocity of reaction can be controlled.
Most important characteristics of gas-liquid reactors are the
both (a) and (b)
Which of the following is a controlling factor in very fast heterogeneous reaction?
Heat and mass transfer effects
Enzymes are destroyed, when the
temperature is very high,
For an autocatalytic reactor, the suitable reactor set up is
CSTR followed by P.F. reactor.
Ionic reactions occur in
solutions
Sometimes, batch process is preferred over continuous process, when the product
both (a) & (b).
In a chemical reaction https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/454-240-1.png , it is observed that the
(i) rate of formation of ‘P’ is doubled on doubling the concentration of ‘X’.
(ii) rate of formation of ‘P’ is quadrupled on doubling the concentration of ‘Y’.
(iii) doubling the concentration of ‘Z’ does not affect the rate of formation of ‘P’.
What is the order of the above chemical reaction?
Third order
The half life period of a first order reaction is given by (where, K = rate constant. )
0.693/K
Half life period of a chemical reaction is
the time required to reduce the concentration of the reacting substance to half its initial value.
In the gaseous phase ammonia formation reaction (N2 + 3H2<–>2NH3), the value of the equilibrium constant depends on the
temperature.
Transition state theory relates the above quantities as
k ∝ T.e^E/RT
Photochemical reaction rate does not depend significantly on temperature, because
the energy of reacting molecules exceeds the activation energy by absorption of light.
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
5/3 kW
According to the ‘law of mass action’, the rate of reaction is directly proportional to the
molar concentration of the reactants.
In a chemical reaction, __________ are conserved.
both(b) & (c)
For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
increases with pressure.
In the reversible reaction of the type, A + B <–> AB, in general
the combination reaction will be exothermic, while the dissociation reaction will be endothermic.
A batch reactor is
suitable for liquid phase reactions involving small production rate.
For a first order reaction carried out in a plug flow reactor, the space time is
1/K ln Co/C
For an isothermal second order aqueous phase reaction, A –> B, the ratio of the time required for 90% conversion to the time required for 45% conversion is
11
A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)
none of these.
Second order consecutive irreversible reactions https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/473-457-1.png were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2)?
45295
Pick out the wrong statement.
Enzymes help in increasing the activation energy of the reaction.
There is no correspondence between stoichiometry and the rate equation in case of a/an __________ reaction.
non-elementary
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?
Inner catalyst core of radius R/8 does not participate in reaction.
Which of the following is used for calcination of limestone and dolomite in industrial practice ?
Moving bed reactor
An imbalanced chemical reaction equation is against the law of
conservation of mass
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 ?
1
