Question

For the reaction a $A\to xP$ when $\left[A\right]=2.2mM$ the rate was found to be $2.4mM{s}^{-1}$ . On reducing concentration of A to half, the rate changes to $0.6mM{s}^{-1}$ . The order of reaction with respect to A is:

• A. 1.5
• B. 2
• C. 2.5
• D. 3

Answer 1

The correct option is B 2

$rate=k[A{]}^n$
$2.4=k(2.2{)}^n-(1)$
Now
$0.6=k(1.1{)}^n-(2)$
$\left(1\right)÷\left(2\right)$
$4=2^n$
only possible when
n = 2