Chemical Reaction Engineering
Catalyst is a substance, which __________ chemical reaction.

Can either increase or decrease the speed of a
Decreases the speed of a
Increases the speed of a
Alters the value of equilibrium constant in a reversible

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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.)

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

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