Chemical Engineering - Chemical Reaction Engineering

46. 

The equilibrium constant K of a chemical reaction depends on

A. temperature only.
B. pressure only.
C. temperature and pressure.
D. ratio of reactants.

Answer: Option A

Explanation:

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47. 

The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

A. increased temperature reduces the activation energy.
B. fraction of molecules having threshold energy increases.
C. collision frequency increases.
D. value of threshold energy decreases.

Answer: Option B

Explanation:

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48. 

Which of the following is not a unit of reaction rate ?

A. Moles for med/(surface of catalyst) (time)
B. Moles formed/volume of reactor) (time)
C. Mole formed/volume of catalyst) (time)
D. None of these

Answer: Option D

Explanation:

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49. 

Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?

A. Langmuir's assumption applies to every adsorbed layer.
B. There is no dynamic equilibrium between successive layer.
C. The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process.
D. none of these.

Answer: Option B

Explanation:

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50. 

The sequence in which three CSTR's of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is

A. 15, 10, 5
B. 5, 10, 15
C. 10, 5, 15
D. 10, 15, 5

Answer: Option A

Explanation:

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