Question

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

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

Answer 1

Answer: (A), (B), (C)

Order of the reaction is 3/2
Unit of its rate constant is $litr{e}^{\frac{1}{2}}mo{l}^{-\frac{1}{2}}se{c}^{-1}$
Unit of rate is $mol.litr{e}^{-1}se{c}^{-1}$

Rate law for the chemical reaction is $Rate=K\left[A{]}^{\frac{1}{2}}\right[B{]}^1$.

(A) Order of the reaction $=\frac{1}{2}+1=\frac{3}{2}$.

(B) Unit of its rate constant $=\frac{concentration}{time\times \left(concentratio{n}^{1.5}\right)}=litr{e}^{\frac{1}{2}}mo{l}^{-\frac{1}{2}}se{c}^{-1}$.

(C) Unit of rate $=\frac{concentration}{time}=mol.litr{e}^{-1}se{c}^{-1}$

(D) Its molecularity can be either 3 (in rare cases) or less than 3.