Q261
Open questionThe reaction between oxygen and organic material is a/an __________ reaction.
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Chemical Engineering · all questionsChemical Reaction Engineering
Chemical Reaction Engineering
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Q262
Open questionWhich of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?
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Q263
Open questionA pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1 m3/h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m3, the volume of the mixed flow reactor should be increased by a factor of
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Q264
Open questionThe decomposition of A into B is represented by the exothermic reaction, A ⇋ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction.
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Q265
Open questionA reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
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Q266
Open questionThe reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
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Q267
Open questionPick out the wrong statement below:
I. For the same conversion, the holding time required in a batch reactor, is always equal to the space time required in a PFR.
II. Two mixed reactors of unequal size are available for producing a specified product, formed by a homogenous second order reaction. To achieve maximum production rate, the smaller reactor should be placed in series before the larger reactor.
III. Arrehenius equation describing the effect of temperature on rate constant is given by,
IV. The mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is:
CH3CHO + I2 → CH3I + HI + CO; slow
CH3I + HI → CH4 + I2; fast
Then the rate of disappearance CH3CHO is equal to K.CCH3l.CHl and acts as a catalyst.
I. For the same conversion, the holding time required in a batch reactor, is always equal to the space time required in a PFR.
II. Two mixed reactors of unequal size are available for producing a specified product, formed by a homogenous second order reaction. To achieve maximum production rate, the smaller reactor should be placed in series before the larger reactor.
III. Arrehenius equation describing the effect of temperature on rate constant is given by,
IV. The mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is:
CH3CHO + I2 → CH3I + HI + CO; slow
CH3I + HI → CH4 + I2; fast
Then the rate of disappearance CH3CHO is equal to K.CCH3l.CHl and acts as a catalyst.
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Q268
Open questionThe reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.
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Q269
Open questionFor a first order reaction carried out in a plug flow reactor, the space time is
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Q270
Open questionWhen the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.
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Q271
Open questionA catalyst loses its activity due to
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Q272
Open questionWhich of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?
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Q273
Open questionWhat is the dispersion number for a plug flow reactor?
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Q274
Open question__________ resistance is not involved in the combustion of a carbon particle.
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Q275
Open questionPick out the wrong statement.
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Q276
Open questionThe excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.
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Q277
Open questionWhich of the following is used for calcination of limestone and dolomite in industrial practice?
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Q278
Open questionThe reactions of high molecularity are rare, because
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Q279
Open questionMolecularity of a reaction
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Q280
Open questionA 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) = -40 kJ/mole; ρ = 1000 kg/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
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