It is true that :
Show Hint
- A first order reaction is always a single step reaction
- A zero order reaction is a multistep reaction
- A zero order reaction is a single step reaction
- A second order reaction is always a multistep reaction
The Correct Option is B
Solution and Explanation
(1) A first order reaction need not be elementary (e.g. decomposition of N2O5 is first order but multistep), so (1) is false.
(2) An elementary reaction cannot have molecularity zero, so a zero order reaction cannot be a single step reaction; it must be a complex (multistep) reaction. Hence (2) is true and (3) is false.
(4) A second order reaction can be elementary (e.g. 2HI → H2 + I2, bimolecular), so (4) is false.
Answer: (2) A zero order reaction is a multistep reaction
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