1.

Explain the terms : (i) Rate determining step of a reaction, (ii) Molecularity of a reaction.

Answer»

Solution :(i) Rate determining step of a reaction (RDS) : The SLOWEST step of the complex reaction is called rate determining step. E.g.,
Thermal decomposition of nitrous oxide
Step I : `N_(2)O OVERSET("Slowest step")rarr N_(2) + O`
Step II : `N_(2)O + O overset("Fast step")rarr N_(2) + O_(2)`
Rate `= K[N_(2)O]`
`2N_(2)O rarr 2N_(2) + O_(2)`
(ii) Molecularity of reaction : It is the number of reacting species undergoing simultaneous collision in the reaction.
it is a theoretical concept.
it can not be ZERO.
It does not change with change in TEMPERATURE and pressure.


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