Q.1
In an ideal P.F.R. at steady state conditions
Q.2
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the
Q.3
In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants)
Q.4
The single parameter model proposed for describing non-ideal flow is the __________ model.
Q.5
Pick out the wrong statement.
Q.6
If helium is introduced in a reactor containing O₂, SO₂ and SO₃ at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO₃ (as per Le Chatlier principle)
Q.7
The temperature dependence of reaction rate constant (K) by Arhenius law is given by
Q.8
Chemical kinetics can predict the __________ of a chemical reaction.
Q.9
The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.
Q.10
B.E.T. method can be used to determine the __________ of a porous catalyst.
Q.11
When a catalyst increases the rate of chemical reaction, the rate constant
Q.12
Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ⇋ 2NH₃.
Q.13
A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to
Q.14
The equilibrium constant K of a chemical reaction depends on
Q.15
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).Csub>Aa-b
Q.16
The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from
Q.17
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?
Q.18
The exit age distribution of fluid leaving a vessel is used to know the
Q.19
In case of staged packed bed reactors carrying out exothermic reaction, use
Q.20
Consider the 'n' th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot?
Q.21
For a tubular flow reactor with uniform concentration and temperature, the independent variable is
Q.22
Which of the following is a characteristic of an ideal plug flow reactor?
Q.23
The energy balance equation over a tubular reactor under transient conditions is
Q.24
For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is
Q.25
The exit age distribution curve E(t) for an ideal CSTR with the average residence time, τ, is given by
Q.26
Helium-mercury method can be used to determine the __________ of the catalyst particle.
Q.27
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 >> (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)
Q.28
For the liquid phase parallel reactions:
R, rR = K?.CA2; E? = 80 KJ/mole
S, rS = K?.CA ; E? = 120 KJ/mole
The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at
Q.29
Which of the following is a controlling factor in very fast heterogeneous reaction?
Q.30
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
Q.31
A catalyst in a chemical reaction __________ free energy change in the reaction.
Q.32
The rate of a homogeneous reaction is a function of
Q.33
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
Q.34
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
Q.35
What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?
Q.36
A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be
Q.37
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.
Q.38
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?
Q.39
A space velocity of 5 hr⁻¹ means that
Q.40
With increase in temperature, the equilibrium conversion of a reversible exothermic reaction
Q.41
Arhenious equation shows the variation of __________ with temperature.
Q.42
The catalytic converter for conversion of SO₂ to SO₃ by contact process should have a feed with SO₂ content between
Q.43
In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffacted by pressure changes ?
Q.44
Space time equals the mean residence time
Q.45
An imbalanced chemical reaction equation is against the law of
Q.46
Carrier in a catalyst increases its
Q.47
The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is
Q.48
Pick out the correct statement.
Q.49
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.
Q.50
For multiple reactions, the flow pattern within the vessel affects the
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