At room temperature, the reaction between NO and $O_{2}$ to give ${NO}_{2}$ is fast, while that between $C O$ and $O_{2}$ is slow. It is due to:

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$C O$ is poisonous

$C O$ is smaller in size that of $N O$

none of the above

the activation energy for the reaction, $2 NO + O_{2} \to 2 {NO}_{2}$ is less than $2 CO + O_{2} \to 2 {CO}_{2}$

answer is C.

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Detailed Solution

Compared to the interaction between $C O$ and oxygen, the reaction between $N O$ and oxygen has a lower activation energy.
As a result, the interaction between oxygen and $N O$ is quick, whereas the reaction between oxygen and $C O$ is long.

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