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 Diffusion within the pellet None of these External mass transfer Reaction Diffusion within the pellet None of these External mass transfer Reaction ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering When a catalyst increases the rate of chemical reaction, the rate constant Remains constant Increases Decreases Becomes infinite Remains constant Increases Decreases Becomes infinite ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The half life period of a first order reaction is given by (where, K = rate constant. ) 6.93 K 2.5 K 0.693/K 1.5 K 6.93 K 2.5 K 0.693/K 1.5 K ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering A catalyst in a chemical reaction __________ free energy change in the reaction. Either A or B; depends on the type of catalyst Increases Neither A nor B Decreases Either A or B; depends on the type of catalyst Increases Neither A nor B Decreases ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering A stirred tank reactor compared to tubular-flow reactor provides Higher overall selectivity for a first order consecutive reaction More uniform operating conditions Permits operation at the optimum temperature for a long reaction time All of these Higher overall selectivity for a first order consecutive reaction More uniform operating conditions Permits operation at the optimum temperature for a long reaction time All of these ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the Temperature is increased Pressure is reduced Temperature is reduced and pressure is increased Temperature is increased and pressure is reduced Temperature is increased Pressure is reduced Temperature is reduced and pressure is increased Temperature is increased and pressure is reduced ANSWER DOWNLOAD EXAMIANS APP
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