A reaction is zero order incase concentration data are plotted versus time & the result is a straight line. The slope of this consequence line is the (-) negative of the zero order rate constant k.
Zero order reaction with respect to “A” would be 2 & with respect to “B” would be 1, the sum of reaction order would be 2 + 1 = 3. Zero order reaction is not necessary that the order of a reaction be a whole number – zero & fractional values of order are possible – but they tend to be integers. Reaction orders can be determined only through experiment. Their knowledge permits conclusions about the reaction mechanism.
A zero-order reaction is a reaction which proceeds at a rate that is independent of reactant concentration. Respectively Increasing or decreasing the concentration of reactants will not speed up or slow down the reaction, those rate of the reaction is equal to the rate constant, k, of that reaction. This property differs from both 1st-order reactions & 2nd-order reactions.
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