Order Vs Molecularity
Which statement is correct?
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More chemical kinetics Practice Questions
The rate constant of a reaction increases by a factor of one hundred when temperature rises from 300...
The rate constant of a reaction increases by a factor of one hundred when temperature rises from 300...
How is the instantaneous rate of a reaction obtained from a graph of concentration plotted against t...
How is the instantaneous rate of a reaction obtained from a graph of concentration plotted against t...
Radioactive decay obeys first order kinetics; if a sample has a half-life of 5 years, what percentag...
Radioactive decay obeys first order kinetics; if a sample has a half-life of 5 years, what percentag...
Define how the threshold energy of a reaction is related to the activation energy and the average en...
Define how the threshold energy of a reaction is related to the activation energy and the average en...
How does a positive catalyst increase the rate of a chemical reaction without itself being consumed ...
How does a positive catalyst increase the rate of a chemical reaction without itself being consumed ...
Distinguish between order and molecularity by deciding which quantity can be fractional for a multis...
Distinguish between order and molecularity by deciding which quantity can be fractional for a multis...
When the temperature of a reaction is raised from 300 K to 310 K, the rate roughly doubles; what doe...
When the temperature of a reaction is raised from 300 K to 310 K, the rate roughly doubles; what doe...
Why does the rate of a zero order reaction remain unchanged even when the concentration of the react...
Why does the rate of a zero order reaction remain unchanged even when the concentration of the react...
What are the units of the rate constant for a reaction that is found experimentally to be second ord...
What are the units of the rate constant for a reaction that is found experimentally to be second ord...
Acid-catalysed hydrolysis of an ester in a large excess of water follows first order kinetics; why i...
Acid-catalysed hydrolysis of an ester in a large excess of water follows first order kinetics; why i...
For a zero order reaction with initial concentration 0.10 M and rate constant 0.005 mol L^-1 s^-1, w...
For a zero order reaction with initial concentration 0.10 M and rate constant 0.005 mol L^-1 s^-1, w...
For a reaction whose slow step involves only one molecule decomposing after a fast equilibrium, how ...
For a reaction whose slow step involves only one molecule decomposing after a fast equilibrium, how ...
About This Question
- Subject
- chemistry
- Chapter
- chemical kinetics
- Topic
- order vs molecularity
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Order is determined experimentally
- Order of Reaction: This is purely an experimental property. It is the sum of the powers of the concentration terms in the experimentally determined rate law.
- Molecularity: This is a theoretical property. It refers to the number of reacting species (atoms, ions, or molecules) that collide simultaneously to bring about proof of an elementary step.
- Key Comparison:
- Order: Can be zero, fractional, or an integer. Determined from experimental data.
- Molecularity: Always a positive integer (1,2,3). It has no meaning for complex (multi-step) reactions.
This easy difficulty chemistry question is from the chapter chemical kinetics, covering the topic of order vs molecularity. It appeared in the 2025 exam.
Looking for more practice? Explore all chemistry questions or browse chemical kinetics questions on RankGuru.