Chemical Reaction Engineering A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by keff = k + kg keff = (kkg)1/2 1/keff = 1/k + 1/kg keff = (k+ kg)/2 keff = k + kg keff = (kkg)1/2 1/keff = 1/k + 1/kg keff = (k+ kg)/2 ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The reason why a catalyst increases the rate of reaction is that, it Decreases the energy barrier for reaction None of these Increases the activation energy Decreases the molecular collision diameter Decreases the energy barrier for reaction None of these Increases the activation energy Decreases the molecular collision diameter ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises form 10 to 100°C. 512 256 612 112 512 256 612 112 ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be 2τ τ/0.693 0.5τ 0.693τ 2τ τ/0.693 0.5τ 0.693τ ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times. 12 16 32 8 12 16 32 8 ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering A batch reactor is characterised by Variation in reactor volume Very low conversion Variation in extent of reaction and properties of the reaction mixture with time Constant residence time Variation in reactor volume Very low conversion Variation in extent of reaction and properties of the reaction mixture with time Constant residence time ANSWER DOWNLOAD EXAMIANS APP
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