JEE Main · 2025 · 23 Jan 2025 · Shift 2 · Chemical Kinetics

For a zero order reaction, the rate is independent of concentration, so integrating rate $=k$ gives $[A]=[A{]}_0-kt$: concentration falls linearly with time, with a constant negative slope of magnitude $k$, reaching zero at a finite time and staying there. The graph showing reactant concentration decreasing linearly with time represents this behaviour.