The unit of rate constant of zero order and first order chemical reactions are respectively :

The unit of the rate constant K is (Molarity)¹⁻ⁿtime^−1.

For first order reaction =(Molarity)^1-1time^-1

                                     =0 sec^-1

For Zero order reaction =(Molarity)^1-0 time^-1

                                                  ⁼ $\left(\frac{\mathrm{moles}}{\mathrm{lit}}\right)$ sec^-1

                                            =moles¹  lit^-1 sec^-1
so the unites of rate constant for zero and first order reaction =moles¹ lit^-1 sec^-1 ,sec^-1