The rate law for the decomposition of hydrogen iodide is $-\frac{\mathrm{d}[\mathrm{HI}]}{\mathrm{dt}}=\mathrm{k}[\mathrm{HI}]^2$. The units of rate constant $\mathrm{k}$ are

• Correct answer
  A

  $\mathrm{L}_{\mathrm{mol}^{-1}} \mathrm{~s}^{-1}$
• B

  $\mathrm{L}^{-1} \mathrm{~mol} \mathrm{~s}^{-1}$
• C

  $\mathrm{L}^2 \mathrm{~mol}^{-2} \mathrm{~s}^{-1}$
• D

  $\mathrm{L}^{1 / 2} \mathrm{~mol}^{-1 / 2} \mathrm{~s}^{-1}$

Hence, the correct answer is option: 'A'.