A reaction is first order in A and second order in B
(i) Write the differential rate equation.
(ii) How is the rate affected on increasing the concentation of B three times ?
(iii) How is the rate affected when the concentration of both A and B are doubled ?

Explanation

(i) `(dx)/(dt)=k[A][B]^(2).`
(ii) Rate `=k" ab"^(2)`
If [B] is tripled, Rate `=ka(3" b")^(2)=9" k ab"^(2)=9" times."`
(iii) If both [A] and [B] are doubled, Rate `=k(2" a")(2" b")^(2)=8" k ab"^(2)=8" times."`