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Question

Choose the correct option regarding order and molecularity:

A
Molecularity for a particular reaction can be fractional
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B
Order for a particular reaction can be fractional
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C
Order of a reaction is a theoretical value
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D
None of the above
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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.

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