Question

which represent a zero order reaction

Answer 1

a reaction in which no reactants will increase or decrease represents the zero order reaction.

Answer 2

In zero order reactions the rate of the reaction is independent from the of reactant's concentration.

Which means in this kind of reaction the rate of the reaction does not changes with the constant change in concentration of reactant.

If the concentration is plotted with the time the graph will be a straight line, this circumstance represents a zero order reaction.