It is true that:
Chemical Kinetics · Class 12 · JEE Main Previous Year Question
It is true that:
- a
A second order reaction is always a multistep reaction
- b✓
A zero order reaction is a multi-step reaction
- c
A first order reaction is always a single step reaction
- d
A zero order reaction is a single step reaction
A zero order reaction is a multi-step reaction
Analysis of each statement:
(1) FALSE — A second order reaction can be elementary (single step), e.g., .
(2) TRUE — A zero order reaction cannot be an elementary reaction (elementary reactions must have order equal to molecularity, which is at least 1). Therefore, a zero order reaction must be a multi-step (complex) reaction where the rate-determining step involves a catalyst or surface.
(3) FALSE — A first order reaction can be multi-step (e.g., radioactive decay is first order and elementary, but many first order reactions are complex).
(4) FALSE — Same reasoning as (2); zero order reactions are multi-step.
Answer: Option (2)
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