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Question

The reaction 2NO2Cl2NO2+Cl2 follows the rate law,

Rate =k[NO2Cl]

The mechanism is,
1st step:
NO2Clk1NO2+Cl
2nd step: NO2Cl+Clk2NO2+Cl2

Which is the rate determining step?

A
2nd step
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B
1st step
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C
Both steps
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D
None of the above
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Solution

The correct option is D 1st step
The rate law expression is =k[NO2Cl]. This does not contain the term corresponding to the concentration of Cl. Hence, the second step is not the rate determining step. The first step is the rate determining step.

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