Question

Rate law fora chemical reaction is:
Rate $=k\left[A{]}^{1/2}\right[B]$
Choose the correct options among the following.

• A. Order of the reaction is $\frac{3}{2}$
• B. Unit of its rate constant is $litr{e}^{1/2}mo{l}^{-1/2}se{c}^{-1}$
• C. Unit of rate is $litr{e}^{-1}se{c}^{-1}$
• D. Its molecularity is always $3$

Answer 1

Answer: (A)

Order of the reaction is $\frac{3}{2}$

Overall order=$\frac{1}{2}+1=\frac{3}{2}$

Unit of rate constant=$mo{l}^{1-n}{L}^{n-1}se{c}^{-1}$

where n=order of the reaction

For given reaction, unit of rate constant=$mo{l}^{-1/2}{L}^{1/2}se{c}^{-1}$