Question:

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.
  • 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, unit of ‘k’ is derived from the rate law: Rate = k[A]$^2$. Therefore, unit is (mol L$^{-1}$ s$^{-1}$)/(mol$^2$ L$^{-2}$) = mol$^{-1}$ L s$^{-1}$.
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