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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

Pick out the wrong statement ?
A For the same conversion, the holding time required in a batch reactor, is always equal to the space time required in a PFR
B Two mixed reactors of unequal size are available for producing a specified product, formed by
C Arrhenius equation describing the effect of temperature on rate constant is given by,
D The mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is:
Correct Answer: The mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is:
Pick out the correct statement ?
A A chemical reaction accompanied by absorption of heat is called an exothermic reaction
B A chemical reaction accompanied by evolution of heat is called an endothermic reaction
C The rate constant for a first order reaction does not change on changing the concentration units
D Chemical equilibrium state is dynamic in nature
Correct Answer: The rate constant for a first order reaction does not change on changing the concentration units
Pick out the correct statement ?
A A catalyst speeds up the forward reaction but slows shown the reverse reaction
B Addition of catalyst changes the equilibrium constant
C Pressure changes do not change the equilibrium concentrations
D The composition of equilibrium is changed by catalyst
Correct Answer: Pressure changes do not change the equilibrium concentrations
Pick out the correct statement ?
A A catalyst does not change AH of the reaction
B A catalyst changes the equilibrium point
C Law of mass action was suggested by Le-Chatelier
D The difference between the energy of reactants and that of the products is the activation
Correct Answer: A catalyst does not change AH of the reaction
Pick out the wrong statement ?
A Autocatalytic reactions are exemplified by microbial fermentation reactions
B The slowest step has the greatest influence on the overall reaction rate in case of an
C The fractional conversion at any time is same for both the constant as well as the variable
D Hydrolysis of ester in presence of alkali or acid is a zero order reaction
Correct Answer: Hydrolysis of ester in presence of alkali or acid is a zero order reaction
Pick out the wrong statement ?
A Visible radiation provides the necessary activation energy in photochemical reactions
B The order and molecularity of a complex reaction may not be the same
C For a second order reaction, the slope of the graph/plot between rate and (concentration) is
D Molecularity of the reaction is always a whole number greater than zero
Correct Answer: The order and molecularity of a complex reaction may not be the same
Pick out the wrong statement ?
A A catalyst does not alter the final position of equilibrium in a reversible reaction
B A catalyst initiates a reaction
C A catalyst is specific in reaction
D A catalyst remains unchanged in chemical composition at the end the reaction
Correct Answer: A catalyst initiates a reaction
Pick out the wrong statement?
A In a first order reaction, A → products; the reaction becomes slower as it proceeds, because
B Transition state theory approaches the problem of calculating reaction rates by concentrating
C According to the penetration theory, the mass transfer co-efficient decreases, if the exposure
D If the rate of an irreversible reaction, A + B → 2C is k.CA.CB, then the reaction is always
Correct Answer: According to the penetration theory, the mass transfer co-efficient decreases, if the exposure
Pick out the wrong statement ?
A ‘Hold back’ is defined as the fraction of material that stays longer than the mean residence time
B Study of non-ideal flow reactor is done experimentally by stimulus-response technique
C For studying a chemical reaction, it is desirable to monitor the reactants during initial stages
D A batch reactor cannot be used to study the kinetics of catalytic reaction
Correct Answer: A batch reactor cannot be used to study the kinetics of catalytic reaction
Pick out the wrong statement pertaining to space velocity of flow reactors?
A The unit of space velocity is (time)-1
B The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions
C The space velocity of 3 hr-1 means that one third reactor volume of feed at specified
D None of these
Correct Answer: The space velocity of 3 hr-1 means that one third reactor volume of feed at specified
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