Chemical Engineering - Chemical Reaction Engineering

46. 

A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by

A. keff = k + kg
B. keff = (k+ kg)/2
C. keff = (kkg)1/2
D.

Answer: Option D

Explanation:

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47. 

Arrhenious equation represents graphically the variation between the __________ and temperature.

A. rate of reaction
B. frequency factor
C. rate constant
D. activation energy

Answer: Option C

Explanation:

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48. 

__________ catalytic reaction is involved in the thermal cracking of gas oil.

A. Homogeneous
B. Homogeneous non
C. Heterogeneous
D. Heterogeneous non

Answer: Option A

Explanation:

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49. 

Variables affecting the rate of homogeneous reactions are

A. pressure and temperature only.
B. temperature and composition only.
C. pressure and composition only.
D. pressure, temperature and composition.

Answer: Option D

Explanation:

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50. 

A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.

A. less than
B. equal to
C. more than
D. equal to or more than

Answer: Option D

Explanation:

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