Chemical Reaction Engineering A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by External mass transfer Diffusion within the pellet None of these Reaction External mass transfer Diffusion within the pellet None of these Reaction ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering Batch process is preferred over continuous process, when the Same equipment can not be used for several processes of the same nature Sales demand of product is not steady All of these Product yields and quality can not be achieved in continuous process, because of long residence time Same equipment can not be used for several processes of the same nature Sales demand of product is not steady All of these Product yields and quality can not be achieved in continuous process, because of long residence time ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m³ .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the 1.60 0.80 2.67 1.33 1.60 0.80 2.67 1.33 ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A. Surface reaction between absorbed A and absorbed B Surface reaction between A in the gas phase and absorbed B Surface reaction between absorbed A and B in the gas phase Absorption of A Surface reaction between absorbed A and absorbed B Surface reaction between A in the gas phase and absorbed B Surface reaction between absorbed A and B in the gas phase Absorption of A ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering In autocatalytic reactions, Catalysts have very high selectivity No catalyst is used One of the reactants acts as a catalyst One of the products acts as a catalyst Catalysts have very high selectivity No catalyst is used One of the reactants acts as a catalyst One of the products acts as a catalyst ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering In an exothermic chemical reaction, the reactants compared to the products have Higher temperature Less energy Same energy More energy Higher temperature Less energy Same energy More energy ANSWER DOWNLOAD EXAMIANS APP
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