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  4. The reaction 2NO(g) + O2 (g) leftharpoons 2NO2 (g) is of first order. If volume of reaction vessel is reduced to (1/3), the rate of reaction would be

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Q. The reaction $2NO(g) + O_2 (g) \rightleftharpoons 2NO_2 (g)$ is of first order. If volume of reaction vessel is reduced to $\frac{1}{3},$ the rate of reaction would be

Chemical Kinetics

Solution:

$2NO (g) + O_2 (g) \, \longrightarrow \, \, 2NO_2 (g)$
When the volume of vessel change into $\frac{1}{3}$ then concentration of reactant become three times. The rate of reaction for first order reaction is directly proportional to concentration. Therefore, rate of reaction will increase three times.