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Question
Choose the correct option regarding order and molecularity:
Choose the correct option regarding order and molecularity:
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Solution
The correct option is B Order for a particular reaction can be fractional
Comparison Between Order and Molecularity
Molecularity of Reaction
Order of Reaction
1
It is defined as the no. of molecules of reactant taking part in a chemical reaction.
It is defined as the sum of the power of concentration terms that appear in rate law.
2
It is always a whole number. It can neither be zero nor fractional.
It may be zero, fractional or integer.
3
It is defined only for elementary reactions.
It is defined for elementary as well as complex reactions.
4
It is a theoretical value.
It is an experimental value.
Comparison Between Order and Molecularity
| Molecularity of Reaction | Order of Reaction | |
| 1 | It is defined as the no. of molecules of reactant taking part in a chemical reaction. | It is defined as the sum of the power of concentration terms that appear in rate law. |
| 2 | It is always a whole number. It can neither be zero nor fractional. | It may be zero, fractional or integer. |
| 3 | It is defined only for elementary reactions. | It is defined for elementary as well as complex reactions. |
| 4 | It is a theoretical value. | It is an experimental value. |
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