Q. Rate of reaction can be expressed by following rate expression, rate=$k\lbrack A\rbrack^{2}\lbrack B\rbrack$, if concentration of A is increased by 3 times and concentration of B is increased by 2 times, how many times rate of reaction increases?
A) 9 times
B) 27 times
C) 18 times
D) 8 times
Explanation
(c)
Given, $R_{1} = k\lbrack A\rbrack^{2}\lbrack B\rbrack$
According to equation $R_{2} = k\lbrack 3A\rbrack^{2}\lbrack B\rbrack$
$= k{\times 9\lbrack A\rbrack}^{2}2\lbrack B\rbrack$
$= 18 \times k\lbrack A\rbrack^{2}\lbrack B\rbrack$
$= 18R_{1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.