Chemical Reaction Engineering MCQ Questions & Answers

21

The rate constant of a chemical reaction increases by increasing the

A) Temperature B) Pressure C) Reactant's concentration D) None of these

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Answer & Solution

Answer: Option A

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22

Knudsen diffusion is directly proportional to

A) T B) $$\sqrt {\text{T}} $$ C) $$\frac{1}{{\sqrt {\text{T}} }}$$ D) T²

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Answer & Solution

Answer: Option B

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23

Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is

A) $$\frac{1}{2}$$ B) $$\frac{1}{3}$$ C) $$\frac{1}{4}$$ D) $$\frac{1}{5}$$

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Answer & Solution

Answer: Option C

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24

For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.

A) Physical B) Chemical C) Both A and B D) Neither A nor B

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Answer & Solution

Answer: Option B

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25

When a catalyst increases the rate of forward reaction, the value of rate constant

A) Increases B) Decreases C) Remain same D) Becomes infinite

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Answer & Solution

Answer: Option A

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26

In the hydrodealkylation of toluene to benzene, the following reactions occur:
C₇H₈ + H₂ → C₆H₆ + CH₄
2C₆H₆ ⇋ C₁₂H₁₀ + H₂
Toluene and hydrogen are fed to a reactor in a molar ratio 1 : 5.80% of the toluene gets converted and the selectivity of benzene (defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is

A) 0.16 B) 0.144 C) 0.152 D) 0.136

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Answer & Solution

Answer: Option B

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27

Half-life period for a first order reaction is __________ the initial concentration of the reactant.

A) Directly proportional to B) Inversely proportional to C) Independent of D) None of these

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Answer & Solution

Answer: Option C

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28

What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?

A) Zero B) First C) Second D) Third

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Answer & Solution

Answer: Option B

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29

Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?

A) Langmuir adsorption isotherm B) Adsorption isobar C) Freundlich adsorption isotherm D) None of these

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Answer & Solution

Answer: Option B

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30

Transition state theory gives the rate constant as

A) $${\text{K}}\alpha \,{{\text{e}}^{ - \frac{{\text{E}}}{{{\text{RT}}}}}}$$ B) $${\text{K}}\alpha \,{{\text{e}}^{\frac{{\text{E}}}{{{\text{RT}}}}}}$$ C) $${\text{K}}\alpha {\text{T}}.{{\text{e}}^{ - \frac{{\text{E}}}{{{\text{RT}}}}}}$$ D) $${\text{K}}\alpha \sqrt {\text{T}} .{{\text{e}}^{ - \frac{{\text{E}}}{{{\text{RT}}}}}}$$

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Answer & Solution

Answer: Option C

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering