Chemical Reaction Engineering
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant
τ = θ , for a non-isothermal reactor
τ = θ , when the fluid density changes in the reactor
τ and θ are always equal

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Chemical Reaction Engineering
The heat of reaction

Depends on both pressure and mechanism of reaction
Depends on the mechanism of reaction only
Is independent of the mechanism of reaction
Depends on the pressure only

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Chemical Reaction Engineering
Promoter.

Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals
Atlers the position of equilibrium in a reversible reaction
All of these
Initiates a chemical reaction and is a catalyst by itself

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