Chemical Reaction Engineering
The reason why a catalyst increases the rate of reaction is that, it

Increases the activation energy
None of these
Decreases the molecular collision diameter
Decreases the energy barrier for reaction

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Chemical Reaction Engineering
Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm² /sec.D1 = diffusion co-efficient; cm²/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm³/sec . V = volume, cm³.)

Thiele modulus (L√(k/D1)
Reduced time (vt/V)
None of these
Reactor dispersion number (D/vL)

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Chemical Reaction Engineering
Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is

Chemical Reaction Engineering
In an ideal mixed reactor (at steady state), the

Space time is equivalent to holding time for constant density systems
Composition throughout the reactor remains same
Exit stream has the same composition as the fluid within the reactor
All of these

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