Chemical Reaction Engineering 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 Zero One Three Two Zero One Three Two ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering 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) ΔHA + ΔHR E + ΔHA E E + ΔHA - ΔHR ΔHA + ΔHR E + ΔHA E E + ΔHA - ΔHR ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order. Zero First None of these Second Zero First None of these Second ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the Increased temperature reduces the activation energy Value of threshold energy decreases Collision frequency increases Fraction of molecules having threshold energy increases Increased temperature reduces the activation energy Value of threshold energy decreases Collision frequency increases Fraction of molecules having threshold energy increases ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The catalyst in a second order reversible reaction increases the rate of the forward reaction And decreases that of backward reaction Only And backward reaction equally To a greater extent than that of the backward reaction And decreases that of backward reaction Only And backward reaction equally To a greater extent than that of the backward reaction ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering Mean residence time is equal to the space time, when All of these The temperature, pressure and the density of reaction mixture remains constant throughout the reactor The feed rate is measured at temperature and pressure in the reactor There is no change in number of moles in gaseous reaction All of these The temperature, pressure and the density of reaction mixture remains constant throughout the reactor The feed rate is measured at temperature and pressure in the reactor There is no change in number of moles in gaseous reaction ANSWER DOWNLOAD EXAMIANS APP
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