How to differentiate between zero order and first order reactions

Dear Student
You can distinguish the order of any reaction on the basis of Molecularity ( in case of single step reaction) and Rate constant.

Order of a single step reaction is equal to its molecularity.

xA + yB → cC + dD

• Rate = k [A]^x [B]^y

• x + y = n = Order of the reaction.

Rate constant:

Units of rate constant is different for each order.