Rate of reaction \(=[A]^a\)
Order of reaction \(= a\)
\([A]_1 = 2.2 \,m\,M\), \(r_1 = 2.4\, m\,M\,s^{-1}\) ... \((i)\)
\([A]_2 = 2.2/2\, m\,M\), \(r_1 = 0.6\,m\,M ^{-1} \) or, \(\frac{{2.4}}{4}\) ..... \((ii)\)
On reducing the concentration of \(A\) to half, the rate of reaction is decreased by four times.
Rate of reaction \(=[A]^2\)
Order of reaction \(= 2.\)