Chemical Reaction

A. For a first order consecutive reaction, a tubular flow reactor as compared to a stirred tank
reactor provides higher overall selectivity
B. For an ideal mixed reactor at steady state, the exit stream has the same composition as fluid
within the reactor and the space time is equivalent to holding time for constant density system
C. Plug flow reactor (PFR) is always smaller than mixed reactor for all positive reaction orders
for a particular duty
D. Reaction rate does not decrease appreciably as the reaction proceeds in case of an
autocatalytic reaction

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
a homogenous second order reaction. To achieve maximum production rate, the smaller
reactor should be placed in series before the larger reactor
C. Arrhenius equation describing the effect of temperature on rate constant is given by,
K = A.e-Ea/RT
D. 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 of CH3CHO is equal to K.CCH3I.CHI and acts as a catalyst

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

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

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
energy

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
irreversible series reaction
C. The fractional conversion at any time is same for both the constant as well as the variable
volume system in case of an irreversible unimolecular type first order reaction
D. Hydrolysis of ester in presence of alkali or acid is a zero order reaction

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
equal to the rate constant (k)
D. Molecularity of the reaction is always a whole number greater than zero

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

A. In a first order reaction, A → products; the reaction becomes slower as it proceeds, because
the concentration of A decreases and the rate is proportional to the concentration of A
B. Transition state theory approaches the problem of calculating reaction rates by concentrating
on the idea of activated complexes
C. According to the penetration theory, the mass transfer co-efficient decreases, if the exposure
time of an eddy to the solute decreases
D. If the rate of an irreversible reaction, A + B → 2C is k.CA.CB, then the reaction is always
elementary

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
and the products during the final stages of reaction
D. A batch reactor cannot be used to study the kinetics of catalytic reaction