Chemical Reaction Engineering
The energy of activation of a chemical reaction

Is the minimum energy which the molecules must have before the reaction can take place
Varies as fifth power of the temperature
Both B and C
Is same as heat of reaction at constant pressure

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Many body collisions are not favoured energetically
Of requirement of very large concentration for such reactions
Of low probability of many body collisions
Of very large activation energy of many bodies

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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.)

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

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