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Why molecularity is applicable only for ...

Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

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A complex proceeds through a number of elementary reactions. Number of molecules involved in each elementary reaction may be different i.e., the molecularity of each step may be different. Therefore, molecularity of overall complex reaction has no sense. On the other hand, order a complex reaction is determined by the slowest step in its mechanism and is valid even in the case of complex reactions.
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U-LIKE SERIES-CHEMICAL KINETICS -LONG ANSWER QUESTIONS-I
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  6. For a certain chemical reaction, variation in concentration In [R] vs...

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  7. Half-life of a first order reaction is 5xx10^(4)s. What percentage of ...

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  8. For a decomposition reaction, the values of rate constant k at two dif...

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  9. The decomposition of N(2)O(5)(g) is a first order reaction with a rate...

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  10. For an elementary reaction 2A+B to 3C the rate of appearance of C ...

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  11. For an elementary reaction 2A+B to 3C the rate of disappearance of...

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  12. The decomposition of N(2)O(5)(g) is a first order reaction with a rate...

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  13. Why can we not determine the order of a reaction by taking into consid...

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  14. Why molecularity is applicable only for elementary reactions and order...

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  19. The rate constant for a first order reaction is 60 s^(-1). How much ti...

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