Which of the following iodine oxides is used for the quantitative analysis of carbon monoxide (CO)?

Iodine pentoxide (I₂O₅) is a powerful oxidizing agent widely used in inorganic chemistry for the quantitative analysis of carbon monoxide (CO). This compound oxidizes carbon monoxide to carbon dioxide in a controlled reaction:

5 CO + I₂O₅ → I₂ + 5 CO₂

In this reaction, I₂O₅ oxidizes CO to CO₂, while itself being reduced to elemental iodine (I₂). This property makes I₂O₅ a standard reagent in laboratory analysis to measure CO concentrations accurately. Its high oxidizing power and stability at room temperature make it ideal for such applications.

Other iodine oxides, such as I₂O₄ and I₄O₂, are less commonly used for this purpose. They are either unstable or do not have the same oxidizing efficiency as I₂O₅. Therefore, for precise and quantitative determination of carbon monoxide, I₂O₅ is preferred over other iodine oxides.

The ability of I₂O₅ to selectively oxidize CO without affecting other gases is crucial in analytical chemistry. It is used in gas analysis, environmental monitoring, and experimental setups requiring accurate measurement of carbon monoxide. The reaction is stoichiometric, which allows for precise calculation of CO amounts based on the mass of iodine produced.

In summary, I₂O₅ (iodine pentoxide) is the iodine oxide used for the quantitative analysis of carbon monoxide due to its high oxidizing capacity, stability, and selectivity. Other iodine oxides are not suitable for such quantitative analytical applications, making I₂O₅ the preferred choice in laboratories and research involving CO measurements.