Answer: zero order.
- A zero order
- B first order
- C second order
- D third order
Correct answer: A. zero order
Explanation: A linear fall of concentration with time is characteristic of a zero-order reaction.
First-order decay curve: concentration halves every t½, and that half-life is constant - a defining test for first-order kinetics.
Concept context
Study the speed of reactions and what affects it: concentration, temperature, and catalysts. Covers rate law, order of reaction, the Arrhenius equation, and reaction mechanisms step by step.