| I. \[2NO\xrightarrow{{}}{{N}_{2}}+{{O}_{2}}\] |
| II. \[3{{O}_{2}}\xrightarrow{{}}2{{O}_{3}}\] |
| III. \[{{N}_{2}}{{O}_{3}}\xrightarrow{{}}NO+N{{O}_{2}}\] |
| IV. \[{{H}_{2}}+{{I}_{2}}\xrightarrow{{}}2HI\] |
A) III only
B) I and III
C) I and IV
D) III and IV
E) I, II and III
Correct Answer: C
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.
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