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The reactions :2CO(g)+O(2)(g)rarr 2CO(2)...

The reactions `:2CO(g)+O_(2)(g)rarr 2CO_(2)(g)` and `2NO(g)+O_(2)(g) rarr 2NO_(2)(g)` look to be similar. Yet the former is slower than latter at same temperature. Why ?

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`2NO(g) + O_(2)(g) to 2NO(g)` is relatively faster . In both the ractions, the stoichiometry is same and number of bonds transformed is also same . The number of electrons shared in CO molecule is 6 and NO molecule is 5. Breaking bond in NO molecules is relatively easy than the in CO molecule . Further NO has unpared election and thus more reactive .
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