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 0.693τ 2τ 0.5τ τ/0.693 0.693τ 2τ 0.5τ τ/0.693 ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as ND = (n + 1)/2 ND = n/2 ND = n + 1 None of these ND = (n + 1)/2 ND = n/2 ND = n + 1 None of these ANSWER DOWNLOAD EXAMIANS APP
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 = (kkg)1/2 keff = (k+ kg)/2 1/keff = 1/k + 1/kg keff = k + kg keff = (kkg)1/2 keff = (k+ kg)/2 1/keff = 1/k + 1/kg keff = k + kg ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering A catalyst is said to be a negative catalyst, ifit Does not initiate the reaction All of these Retards the rate of reaction Reduces the value of equilibrium constant Does not initiate the reaction All of these Retards the rate of reaction Reduces the value of equilibrium constant ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to D √d D1.5 D2 D √d D1.5 D2 ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is 1 -0.5 -0.25 1 -0.5 -0.25 ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS