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.Management Sciences
Category: Chemical Reaction
With increase in temperature, the rate constant obeying Arrhenius equation____________________?
A. Increases
B. Decreases
C. Decreases exponentially
D. Can either increase or decrease; depends on the frequency factor
Pick out the wrong statement?
A. In a first order reaction, A → products; the reaction becomes slower as it proceeds, because
the concentration of A decreases and the rate is proportional to the concentration of A
B. Transition state theory approaches the problem of calculating reaction rates by concentrating
on the idea of activated complexes
C. According to the penetration theory, the mass transfer co-efficient decreases, if the exposure
time of an eddy to the solute decreases
D. If the rate of an irreversible reaction, A + B → 2C is k.CA.CB, then the reaction is always
elementary
Helium-mercury method can be used to determine the _____________ of the catalyst particle?
A. Pore volume
B. Solid density
C. Porosity
D. All A., B., & C.
Find a mechanism that is consistent with the rate equation and reaction given below ?
2A + B → A2B, ( – rA) = k.CA.CB
A. A + B ⇌ AB; AB + A → A2B
B. A + B → AB; AB + A → A2B
C. A + A → AA; AA + B → A2B
D. A + A ⇌ AA; AA + B → A2B
Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of _______________ order?
A. First
B. Zero
C. Second
D. Third
A space velocity of 5 hr-1 means that ___________________?
A. Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
B. After every 5 hours, reactor is being filled with the feed
C. Cent per cent conversion can be achieved in at least 5 hours
D. A fixed conversion of a given batch of feed takes 5 hours
The reactions of high molecularity are rare, because________________?
A. Of very large activation energy of many bodies
B. Of low probability of many body collisions
C. Many body collisions are not favoured energetically
D. Of requirement of very large concentration for such reactions
Which of the following factors control the design of a fluid-solid reactor ?
A. Reaction kinetics for single particle
B. Size distribution of solids being treated
C. Flow patterns of solids and fluid in the reactor
D. All A., B. and C.
For all positive reaction orders for a particular duty ?
A. Mixed reactor is always larger than the plug-flow reactor
B. Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order
C. Reactor size is independent of the type of flow
D. Density variation during reaction affects design
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