Q. In a reaction$\ A + B \rightarrow C$, the rate expression is$\ R = k\lbrack A\rbrack\lbrack B\rbrack^{2}$. If the concentration of both the reaction is doubled at constant volume then the rate of the reaction will be

A) Eight time
B) Double
C) Quadruple
D) Triple
Explanation

(a)
Given ,$\ R = k\lbrack A\rbrack\lbrack B\rbrack^{2}$
Where [A]=[2A]and B=[2B]
$R' = k\lbrack 2A\rbrack\lbrack 2B\rbrack^{2}$
$= k\lbrack 2A\rbrack 4\lbrack B\rbrack^{2}$
$= 8k\lbrack A\rbrack\lbrack B\rbrack^{2}$
R’=8R
Thus, the rate will become eight times

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.