Engineering Chemistry Questions and Answers – Integrated Rate Equation and Half Lives

This set of Engineering Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Integrated Rate Equation and Half Lives”.

1. For a zero order reaction, the rate of reaction is independent of ___________
a) Temperature
b) Nature of reactants
c) Concentration of reactants
d) Effect of catalyst
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2. The half-life period of zero order reaction is directly proportional to the ___________
a) Rate constant
b) Initial concentration of reactants
c) Final concentration of reactants
d) Concentration of products
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3. Which of the following is not an example of zero order reaction?
a) Photochemical combination of hydrogen and chlorine
b) Decomposition of ammonia over molybdenum surface
c) Thermal decomposition of HI on gold surface
d) Inversion of cane sugar in the presence of mineral acids
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4. For a first order reaction, the half life period is independent of the ___________
a) Initial concentration of the reactants
b) Final concentration of the reactants
c) Rate constant
d) Concentration of products
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5. The thermal decomposition of nitrogen pentaoxide in the gaseous phase is the example of ___________
a) Zero order reaction
b) Half order reaction
c) First order reaction
d) Second order reaction
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6. A compound decomposes according to the first order rate law with a half life period of 30 min. What will be the fraction of the remaining compound after 120 min?
a) 0.625
b) 0.0625
c) 0.25
d) 0.025
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7. In a first order reaction, the time required for the completion of 99% is _______ for its 90% completion.
a) Same
b) Negligible
c) Thrice
d) Twice
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8. In a first order reaction, the time required for the completion of 99% is _______ times the time required for the completion of half of the reaction.
a) 5
b) 10
c) 20
d) 50
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9. The half life period of first order reaction is 15 min. Its rate constant will be equal to ___________
a) 0.0462 min^-1
b) 0.462 min^-1
c) 0.00462 min^-1
d) 0.562 min^-1
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10. For a second order reaction, the rate is proportional to the square root of the concentration of the same reactant.
a) True
b) False
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11. Which of the following is not an example of second order reaction?
a) Oxidation of hydrogen bromide
b) Saponification of ester
c) Acid catalyzed hydrolysis of ester
d) Gaseous decomposition of hydrogen iodide
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12. The half life period of n^th order reaction varies inversely to ____________ ^th power of the initial concentration of the reactants.
a) n
b) 2n
c) (n+1)
d) (n-1)
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13. The order of the reaction, if the time of half-completion is changed from 50 sec to 25 sec, when the initial concentration is changed from 0.5 to 1M will be ___________
a) 0
b) 1
c) 2
d) 3
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Sanfoundry Global Education & Learning Series – Engineering Chemistry.

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