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  4. The following homogeneous gaseous reactions were experimentally found to be second order overall.

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Q. The following homogeneous gaseous reactions were experimentally found to be second order overall.

CMC MedicalCMC Medical 2011

Solution:

$ 2NO\xrightarrow{{}}{{N}_{2}}+{{O}_{2}} $ $ \text{Rate}=k\,{{[NO]}^{2}} $ Hence, order of reaction is 2. $ {{H}_{2}}+{{I}_{2}}\xrightarrow{{}}2HI $ $ Rate=k\,[{{H}_{2}}]\,[{{I}_{2}}] $ Hence, order of reaction is (1 + 1) = 2 Therefore, these reactions are most likely to be elementary reaction that occur in one step.