\(r=k[C O]^{2}\)
Let initial concentration of \(CO\) is a i.e. \([C O]=a\)
\(r_{1}=k(a)^{2}=k a^{2}\)
when concentration becomes doubled, i.e. \([\mathrm{CO}]=2 a\)
\(\therefore r_{2}=k(2 a)^{2}=4\, k a^{2}\)
\(\therefore \quad r_{2}=4 r_{1}\)
So, the rate of reaction becomes \(4\,times\) .
$A_2 $ $\rightleftharpoons$ $ A + A$ ....... (ઝડપી) ;
$A + B_2\rightarrow AB + B$ ..... (ધીમી) ;
$ A + B \rightarrow AB$ ...... (ઝડપી)