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Which of the following is correct?
 

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a
Molecularity of a reaction is always same as the order of reaction
 
b
In some cases molecularity of the reaction is same as the order of reaction
 
c
Molecularity of the reaction is always more than order of reaction
 
d
Molecularity never be equal to order

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detailed solution

Correct option is B

 If the reaction is elementary reaction then order and molecularity have same value because elementary reaction proceeds in a single step.
For example:

                       2Na+Br22NaBr

Molecularity =2+1=3
Order-
 r=k[Na]2+[Br]1 r=2+1 r=3
In some cases molecularity = rate of reaction

 

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