CHEMICAL REACTION ENGINEERING QUIZ

The following gas phase reactions are carried out isothermally in a CSTR.A → 2R ; r₁ = K₁pA ;K₁ = 20mole/(sec.m³ bar)A → 3S ; r₂ = K₂ pA ;K₂ = 40mole/ (sec.m³ .bar)What is the maximum possible value of FR(mole/sec.) ?

43833

43832

2

43864

TRUE ANSWER : ?
YOUR ANSWER : ?

A catalyst is said to be a negative catalyst, ifit

Does not initiate the reaction

Retards the rate of reaction

All of these

Reduces the value of equilibrium constant

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For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ and θ are always equal

τ = θ , when the fluid density changes in the reactor

τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant

τ = θ , for a non-isothermal reactor

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

A + A ⇋ AA;AA + B → A₂B

A + B ⇋ AB ; AB + A → A₂B

A + B ⇋ AB;AB + A → A₂B

A + A ⇋ AA;AA + B → A₂B

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Which of the following is a characteristic of an ideal plug flow reactor?

Axial dispersion

Flat velocity profile

None of these

Uniform mixing

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If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to

(E + ED) where ED is activation due to diffusion

ED/2

The intrinsic activation energy E

(E + ED)/2

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A batch reactor is

Least expensive to operate for a given rate

Suitable for liquid phase reactions involving small production rate

Suitable for gas-phase reactions on commercial scale

Most suitable for very large production rate

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A catalyst promoter

All of these

Improves the activity of a catalyst

Acts as a catalyst support

Itself has very high activity

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For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by

A step function

A ramp function

A dirac delta function

None of these

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The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Reaction may be elementary with molecularity of 2

Reaction is elementary with a molecularity of 2

Molecularity of the reaction is 2, but the reaction may not be elementary

Reaction is elementary but the molecularity may not be 2

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