Order Vs Molecularity
Easychemistry
Which statement is correct?
Select the correct option:
Solution
Incorrect! 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.
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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.
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