Chemical Engineering

An isothermal aqueous phase reversible reaction, P R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP – 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is

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Question: An isothermal aqueous phase reversible reaction, P R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP – 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is
[A].

0.80

[B].

1.33

[C].

1.60

[D].

2.67

Answer: Option C

Explanation:

No answer description available for this question.

For an isothermal second order aqueous phase reaction, A B, the ratio of the time required for 90% conversion to the time required for 45% conversion is

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Question: For an isothermal second order aqueous phase reaction, A B, the ratio of the time required for 90% conversion to the time required for 45% conversion is
[A].

2

[B].

4

[C].

11

[D].

22

Answer: Option C

Explanation:

No answer description available for this question.

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

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Question: 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:

No answer description available for this question.

An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction

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Question: An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction
[A].

is maximum at the inlet of the reactor.

[B].

goes through a maximum along the length of the reactor.

[C].

goes through a minimum along the length of the reactor.

[D].

is maximum at the exit of the reactor.

Answer: Option A

Explanation:

No answer description available for this question.

For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant

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Question: For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
[A].

is independent of pressure.

[B].

increases with pressure.

[C].

decreases with pressure.

[D].

increases /decreases with pressure depending on the stoichiometric co-efficients of the reaction.

Answer: Option B

Explanation:

No answer description available for this question.

Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes.

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Question: Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes.
[A].

Strong pore diffusion control and mass transfer not controlling.

[B].

Both pore diffusion and mass transfer not controlling.

[C].

Both pore diffusion and mass transfer controlling.

[D].

Mass transfer controlling.

Answer: Option A

Explanation:

No answer description available for this question.

A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3 ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1 ; (ΔH) = – 40kJ/mole; ρ = 1000kg/m3CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is

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Question: A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3 ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1 ; (ΔH) = – 40kJ/mole; ρ = 1000kg/m3CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
[A].

2/3 kW

[B].

1kW

[C].

5/3 kW

[D].

4kW

Answer: Option C

Explanation:

No answer description available for this question.

Find a mechanism that is consistent with the rate equation and reaction given below:2A + B A2B, ( – rA) = k.CA.CB

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Question: 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

Answer: Option D

Explanation:

No answer description available for this question.

An elementary liquid phase decomposition reaction is to be carried out in a CSTR. The design equation is

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Question: An elementary liquid phase decomposition reaction is to be carried out in a CSTR. The design equation is
[A].

kτ = XA/(1 – XA)

[B].

kτ = XA(1 + XA)/(1 + XA)

[C].

kτ = XA/(1 – XA)2

[D].

Answer: Option A

Explanation:

No answer description available for this question.