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 None of these External mass transfer Diffusion within the pellet Reaction None of these External mass transfer Diffusion within the pellet Reaction ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering Which of the following is not a chemical step in a fluid solid catalytic reaction? Adsorption Surface chemical reaction None of these Desorption Adsorption Surface chemical reaction None of these Desorption ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on? Litre/second Moles/litre.second Litre/mole.second Litre/mole Litre/second Moles/litre.second Litre/mole.second Litre/mole ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering Enzymes are destroyed, when the Reactant's concentration is very high Reactant's concentration is very low Reaction rate is independent of the reactant's concentration Temperature is very high Reactant's concentration is very high Reactant's concentration is very low Reaction rate is independent of the reactant's concentration Temperature is very high ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship. T ∝ an T ∝ 1/an + 1 T ∝ 1/an - 1 T ∝ 1/an T ∝ an T ∝ 1/an + 1 T ∝ 1/an - 1 T ∝ 1/an ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume. Data insufficient; can't be predicted More than Same as Less than Data insufficient; can't be predicted More than Same as Less than ANSWER DOWNLOAD EXAMIANS APP
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