CRE

Question 1

Which of the following will give maximum gas conversion ?
Fixed bed reactor.
Fluidised bed reactor.
Semi-fluidised bed reactor.
Plug-flow catalytic reactor.

Answer 1

Semi-fluidised bed reactor.
A Semi-fluidized bed can be viewed as the combination of a batch fluidized bed at the bottom and a fixed bed at the top within a single vessel. This type of technique overcomes the disadvantages of fluidized bed namely back mixing of solids, attrition of solids and problems involving erosion of surfaces. This also overcomes certain drawbacks of the packed bed, viz, Non-uniformity in temperature in the bed, channel flow and segregation of solids.

Question 2

__________ explains the mechanism of catalysis

Answer 2

Activated complex theory

Question 3

From among the following, choose one which is not an exothermic process.
Methanol synthesis
Catalytic cracking
Ammonia synthesis
Oxidation of sulphur

Answer 3

Catalytic cracking

Question 4

The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is
0.5

Answer 4

2

Question 5

A catalyst
initiates a reaction.
lowers the activation energy of reacting molecules.
is capable of reacting with any one of the reactants.
can not be recovered chemically unchanged at the end of a chemical reaction.

Answer 5

lowers the activation energy of reacting molecules.

Question 6

What is the order of a chemical reaction, , A plus 2B -> C with K if the rate of formation of ‘C’, increases by a factor of 2.82 on doubling the concentration of ‘A’ and increases by a factor of 9 on trebling the concentration of ‘B’?
7/2
7/4
5/2
5/4