Question

For the elementary reaction $A+B\to 2C$ the experiment data suggested that $\text{Rate}\left(r\right)=k\left[A\right]\left[B\right]$. The molecularity and order of the reaction are respectively:

• A. $2,0$
• B. $2,1$
• C. $1,\text{Cannot be predicted}$
• D. $2,2$

Answer 1

The correct option is D $2,2$

For the reaction:
$A+B\to 2C$
$r=k\left[A\right]\left[B\right]$
Overall order is the sum of stoichiometric coefficients in the rate law expression
So order is 2
For elementary reactions, order is equal to molecularity
So, molecularity is also 2