Chemical Reaction Engineering MCQ Questions & Answers

51

If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.

A) $${\text{t}} \propto \frac{1}{{{{\text{a}}^{\text{n}}}}}$$ B) $${\text{t}} \propto \frac{1}{{{{\text{a}}^{{\text{n}} - 1}}}}$$ C) $${\text{t}} \propto \frac{1}{{{{\text{a}}^{{\text{n}} + 1}}}}$$ D) $${\text{t}} \propto {{\text{a}}^{\text{n}}}$$

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Answer & Solution

Answer: Option B

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52

In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

A) Fast reactions in catalyst of small pore diameter B) Fast reaction in catalyst of large pore diameter C) Slow reactions in catalyst of small pore diameter D) Slow reactions in catalyst of large pore diameter

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Answer & Solution

Answer: Option C

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53

For a mixed flow reactor operating at steady state, the rate of reaction is given by

A) $$\frac{{{{\text{F}}_{{{\text{A}}_{\text{0}}}}}}}{{\text{V}}} - \frac{{{\text{d}}{{\text{C}}_{\text{A}}}}}{{{\text{dt}}}}$$ B) $$\frac{{{{\text{F}}_{{{\text{A}}_{\text{0}}}}}}}{{\text{V}}} + \frac{{{\text{d}}{{\text{C}}_{\text{A}}}}}{{{\text{dt}}}}$$ C) $$\frac{{{{\text{F}}_{{{\text{A}}_{\text{0}}}}}}}{{\text{V}}} \cdot {{\text{X}}_{\text{A}}}$$ D) $$ - \frac{{{\text{d}}{{\text{C}}_{\text{A}}}}}{{{\text{dt}}}}$$

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Answer & Solution

Answer: Option C

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54

The catalyst in a second order reversible reaction increases the rate of the forward reaction

A) And decreases that of backward reaction B) And backward reaction equally C) Only D) To a greater extent than that of the backward reaction

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Answer & Solution

Answer: Option B

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55

A photochemical reaction is __________ light.

A) Initiated by B) Accompanied with emission of C) Catalysed by D) Used to convert heat energy into

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Answer & Solution

Answer: Option A

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56

The rate constant of a reaction is a function of the

A) Time of reaction B) Temperature of the system C) Extent of reaction D) Initial concentration of the reactants

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Answer & Solution

Answer: Option B

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57

With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will

A) Increase B) Decrease C) Remain same D) Data in insufficient; can't be predicted

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Answer & Solution

Answer: Option A

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58

The rate at which a chemical substance reacts is proportional to its

A) Active mass B) Equivalent weight C) Molecular weight D) None of these

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Answer & Solution

Answer: Option A

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59

The rate at which a chemical substance reacts is proportional to its

A) Active mass B) Molecular weight C) Equivalent weight D) Atomic weight

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Answer & Solution

Answer: Option A

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60

A first order reaction requires two equal sized CSTR. The conversion is

A) Less when they are connected in series B) More when they are connected in series C) More when they are connected in parallel D) Same whether they are connected in series or in parallel

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Answer & Solution

Answer: Option B

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering