Chemical Engineering - Chemical Reaction Engineering

46. 

Sulphuric acid is used as a catalyst in the

A. hydrogenation of oils.
B. gas phase oxidation of SO2 in chamber process.
C. alkylation of hydrocarbons.
D. none of these.

Answer: Option C

Explanation:

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47. 

Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 2NH3.

A. increases
B. decreases
C. remains unchanged
D. unpredictable from the data

Answer: Option A

Explanation:

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48. 

Pick out the wrong statement.

A. The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively.
B. Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant.
C. Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
D. In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in logitudinal direction.

Answer: Option C

Explanation:

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49. 

The reason why a catalyst increases the rate of reaction is that, it

A. decreases the energy barrier for reaction.
B. increases the activation energy.
C. decreases the molecular collision diameter.
D. none of these.

Answer: Option A

Explanation:

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50. 

A first order irreversible reaction, A B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.

A. both conversion as well as concentration are same
B. conversion in both will be the same but concentrations will be different
C. both the conversion as well as concentrations will be different
D. none of these.

Answer: Option B

Explanation:

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