State the order with respect to each reactant and overall order for the following reaction :
`H_2O_2+3I^(-)+2H^(+)rarr2H_2O+I_3^(-)(aq)`
Rate=`K[H_2 O_2][I^(-)]`
What are the units of rate constant?

Explanation

Rate Exprution = `k [H_2O_2][I^(-)]`
Order w.r.t. `(H_2O_2)` is 1
One order w.r.t. `[I^(-)]` is 1.
Overall order of `ralpha^(n) = 1+1=2 `
Units of rate constant = `mol^(-1) l sec^(-1)`