Question

The rate of a reaction between A and B increases by a factor of 1000 times when the concentration of A is changed from 0.1 mole litre${}^{-1}$ to 1 mole litre ${}^{-1}$. The order of the reaction with respect of A is:

• A. 2
• B. 1
• C. 3
• D. 4

Answer 1

The correct option is C 3

$rate=k[A{]}^m$
$r\to 1000r$
for
0.1 [A] $\to 1\left[A\right]$
i.e.$\left[A\right]\to 10\left[A\right]$
so rate
$1000=(10{)}^m$
m = 3

Thus order of the reaction is 3.