Chemical Reaction Engineering
For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.

16
8
43838
43846

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

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

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Chemical Reaction Engineering
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

Catalyst size is reduced or the catalyst diffusivity is increased
Catalyst size is reduced or the catalyst diffusivity is reduced
Catalyst size is increased or the catalyst diffusivity is reduced
Catalyst size is increased or the catalyst diffusivity is increased

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Chemical Reaction Engineering
For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a

Tubular reactor is preferred over a single CSTR for high yield
Batch reactor is preferred over a single CSTR for high yield
Both A and B
Single CSTR is the most suitable

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