Chemical Reaction Engineering MCQ Questions & Answers

1

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 $${{\text{k}}_{\text{g}}}$$ respectively. The effective rate constant (k_eff) is given by

A) $${{\text{k}}_{\text{e}}}{\text{ff}} = {\text{k}} + {{\text{k}}_{\text{g}}}$$ B) $${{\text{k}}_{\text{e}}}{\text{ff}} = \frac{{{\text{k}} + {{\text{k}}_{\text{g}}}}}{2}$$ C) $${{\text{k}}_{\text{e}}}{\text{ff}} = {\left( {{\text{k}}{{\text{k}}_{\text{g}}}} \right)^{\frac{1}{2}}}$$ D) $$\frac{1}{{{{\text{k}}_{\text{e}}}{\text{ff}}}} = \frac{1}{{\text{k}}} + \frac{1}{{{{\text{k}}_{\text{g}}}}}$$

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Answer & Solution

Answer: Option D

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2

The half life period of a first order reaction is given by (where, K = rate constant. )

A) 1.5 K B) 2.5 K C) $$\frac{{0.693}}{{\text{K}}}$$ D) 6.93 K

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Answer & Solution

Answer: Option C

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3

Catalyst is a substance, which __________ chemical reaction.

A) Increases the speed of a B) Decreases the speed of a C) Can either increase or decrease the speed of a D) Alters the value of equilibrium constant in a reversible

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Answer & Solution

Answer: Option A

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4

A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)

A) $$ \propto {\text{CA}}$$ B) $$ \propto \frac{1}{{{\text{CA}}}}$$ C) Independent of temperature D) None of these

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Answer & Solution

Answer: Option D

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5

Higher free energy of activation of a chemical reaction (at a given temperature) implies

A) Slower rate of reaction B) Higher rate of reaction C) Higher equilibrium conversion D) Both B and C

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Answer & Solution

Answer: Option A

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6

If the rate of a chemical reaction becomes slower at a given temperature, then the

A) Initial concentration of the reactants remains constant B) Free energy of activation is lower C) Entropy changes D) Free energy of activation is higher

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Answer & Solution

Answer: Option D

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7

The eddy diffusivity for a liquid in plug flow must be

A) 1 B) 0 C) ∞ D) Between 0 and 1

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Answer & Solution

Answer: Option B

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8

The most suitable reactor for carrying out an auto-thermal reaction is a

A) Batch reactor B) CSTR C) Semi-batch reactor D) Plug-flow reactor

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Answer & Solution

Answer: Option B

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9

In an ideal tubular-flow reactor

A) There is no mixing in longitudinal direction B) Mixing takes place in radial direction C) There is a uniform velocity across the radius D) All of the above

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Answer & Solution

Answer: Option D

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10

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

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Answer & Solution

Answer: Option A

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering