Chemical Reaction Engineering
Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature?

Useful volume of the tank
Time
None of these
Diameter of the reactor

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Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
All of these
High recycle for pure gas
Plug flow for dilute liquid requiring no large preheating of feed

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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 A in the gas phase and absorbed B
Absorption of A
Surface reaction between absorbed A and absorbed B
Surface reaction between absorbed A and B in the gas phase

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