Question:medium
Unit of rate constant ‘k’ for a second order reaction is:
Unit of rate constant ‘k’ for a second order reaction is:
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Always derive rate constant units by balancing rate law dimensions.
Updated On: Feb 24, 2026
- s$^{-1}$
- mol L$^{-1}$ s$^{-1}$
- mol$^{-1}$ L s$^{-1}$
- mol$^{-2}$ L s$^{-1}$
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The Correct Option is C
Solution and Explanation
For a second-order reaction, the unit of 'k' is determined from the rate law: Rate = k[A]$^2$. Thus, the unit is (mol L$^{-1}$ s$^{-1}$)/(mol$^2$ L$^{-2}$) which simplifies to mol$^{-1}$ L s$^{-1}$.
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