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Chemical Kinetics — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryChemical Kinetics2 Marks
Question
What are the units for rate constants for zero order and second order reactions if time is expressed in seconds and concentration of reactants in $mol / L$ ?
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Answer

(a) For a zero order reaction, the rate constant has units, $molL ^{-1} s^{-1}$.
(b) For second order reaction,
Rate $=k \times[\text { Reactant }]^{25}$
$\therefore k=\frac{\text { Rate mol } L^{-1} s^{-1}}{[\text { Reactant }]_{\left[\text {mol }_{L^{-1}}\right]^2}} mol^{-1} Ls^{-1}$
Units of $k$ are $mol ^{-1} L s^{-1}$

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