(a) Reaction is A $\to$ B for second order kinetics



So the rate of formation of $\mathit{B}$ will increase by 9 times.
(b) The reaction that have higher order true rate law but are found to behave as first order are known as pseudo first order reactions.
Example : Consider the acid hydrolysis of methyl acetate.
${\mathit{C}\mathit{H}}_3{\mathit{C}\mathit{O}\mathit{O}\mathit{C}\mathit{H}}_{3\left(\mathit{a}\mathit{g}\right)}+{\mathit{H}}_2{\mathit{O}}_{\left(\mathit{e}\right)}\mathrm{}$ $\to {\mathit{C}\mathit{H}}_3{\mathit{C}\mathit{O}\mathit{O}\mathit{H}}_{\left(\mathit{a}\mathit{g}\right)}+$ ${\mathit{C}\mathit{H}}_3{\mathit{O}\mathit{H}}_{\left(\mathit{a}\mathit{g}\right)}$