Chemical Reaction Engineering

Question: In case of a/an __________ chemical reaction, conversion increases with the rise in temperature.
[A].

reversible exothermic

[B].

irreversible exothermic

[C].

irreversible endothermic

[D].

reversible endothermic

Answer: Option D

Explanation:

No answer description available for this question.

Question: Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
[A].

proportional to

[B].

independent of

[C].

inversely proportional to

[D].

proportional to the square of

Answer: Option A

Explanation:

No answer description available for this question.

Question: Limiting reactant in a chemical reaction decides the
[A].

rate constant

[B].

conversion

[C].

reaction speed

[D].

equilibrium constant.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Organic catalysts differ from the inorganic catalyst in the sense that the former is
[A].

active at cryogenic temperatures only.

[B].

prohibitively costly.

[C].

proteinous in nature.

[D].

active at very high temperature only.

Answer: Option C

Explanation:

No answer description available for this question.

Question: B.E.T. method can be used to determine the __________ of a porous catalyst.
[A].

solid density

[B].

pore volume

[C].

surface area

[D].

all (a), (b) and (c)

Answer: Option C

Explanation:

No answer description available for this question.

Question: A reactor is generally termed as an autoclave, when it is a
[A].

high pressure batch reactor.

[B].

atmospheric pressure tank reactor.

[C].

high pressure tubular reactor.

[D].

atmospheric pressure CSTR.

Answer: Option A

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: In Langmuir treatment of adsorption,
[A].

whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule.

[B].

whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site.

[C].

all the adsorption does not take place by the same mechanism.

[D].

extent of adsorption is more than one complete monomolecular layer on the surface.

Answer: Option B

Explanation:

No answer description available for this question.

Question: For a heterogeneous catalytic reaction
[A].

free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction.

[B].

a relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important.

[C].

the catalyst does not form an intermediate complex with the reactant.

[D].

the surface of the catalyst does not play an important role during reaction.

Answer: Option A

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.