Chemical Kinetics MCQs Question and Answer in Engineering Chemistry

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11.
A reaction proceeds through the formation of an intermediate B in a unimolecular reaction \[A\xrightarrow{{{k_a}}}B\xrightarrow{{{k_b}}}C\]
The integrated rate law for this reaction is

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13.
In a homogeneous catalytic reaction, 1.0 M of a substrate band 1.0 μM of a catalyst yields 1.0 mM of a product in 10 s. The turnover frequency (TOF) of the reaction (S-1) is

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14.
For the reaction, P + Q + R → S, experimental data for the measured initial rates is given below:
Expt. Initial conc. P
(M)		 Initial conc. Q
(M)		 Initial conc. R
(M)		 Initial rate
(m/s)
1 0.2 0.5 0.4 8.0 × 10-5
2 0.4 0.5 0.4 3.2 × 10-4
3 0.4 2.0 0.4 1.28 × 10-3
4 0.1 0.25 1.6 4.0 × 10-5
The order of the reaction with respect to P, Q and R respectively, is

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15.
A reaction follows second order rate law, $$\frac{{ - d\left[ A \right]}}{{dt}} = k{\left[ A \right]^2},$$    if

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16.
The half-life (t1/2) for the hydrolysis of an ester varies with the initial concentration of the reactant ([E]0) as follows:
[E]0/10 mol/L 5.0 4.0 3.0
t1/2/s 240 300 400
The order of the reaction is

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17.
The specific rate constant of decomposition of a compound is represented by $$\ln k = 5.0 - \frac{{12000}}{T}$$
The activation energy of decomposition foe this compound at 300 K is

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19.
The fluorescence life time of a molecule in solution is 10 ns. If the fluorescence quantum yield is 0.1, the rate constant of fluorescence decay is

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