KEAM 2011 Physics and Chemistry Paper

For the reaction A⟶ products;
let the order of reaction is n. Then
r=k[A]n
=k×(1.2×10−3)n...(i)
At the initial concentration of 3.24×10−2M the rate is 9 times. Hence,
9r=k×(3.24×10−2)n.........(ii)
On dividing, ‌

9r

r

=‌

k×(3.24×10−2)n

k×(1.2×10−3)n

9=(27)n
9=(33)2∕3
∴‌‌n=‌

2

3