Question:
Which halogen oxide is used in the estimation of carbon monoxide?
Which halogen oxide is used in the estimation of carbon monoxide?
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A favourite examination fact:
\[
I_2O_5 + 5CO
\rightarrow
I_2 + 5CO_2
\]
Remember: Iodine pentoxide is the reagent used for estimation of carbon monoxide.
Updated On: Jun 10, 2026
- \(Cl_2O_7\)
- \(BrO_3\)
- \(I_2O_7\)
- \(I_2O_5\)
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The Correct Option is D
Solution and Explanation
Concept:
Carbon monoxide is a poisonous gas. Its estimation is based on its reducing nature.
Iodine pentoxide (\(I_2O_5\)) acts as a strong oxidizing agent and quantitatively oxidizes carbon monoxide into carbon dioxide.
The amount of iodine liberated is proportional to the amount of carbon monoxide present.
Step 1: Write the reaction \[ I_2O_5 + 5CO \rightarrow I_2 + 5CO_2 \] In this reaction:
• Carbon monoxide is oxidized to carbon dioxide.
• Iodine pentoxide is reduced to iodine.
Step 2: Understand why it is used The reaction proceeds quantitatively. Since a fixed amount of iodine is liberated for a given amount of carbon monoxide, the concentration of CO can be determined accurately.
Step 3: Eliminate other options \[ Cl_2O_7,\ BrO_3,\ I_2O_7 \] are not used for this analytical estimation. The standard reagent is: \[ \boxed{I_2O_5} \] Hence the correct answer is \[ \boxed{\text{(D)}} \]
Step 1: Write the reaction \[ I_2O_5 + 5CO \rightarrow I_2 + 5CO_2 \] In this reaction:
• Carbon monoxide is oxidized to carbon dioxide.
• Iodine pentoxide is reduced to iodine.
Step 2: Understand why it is used The reaction proceeds quantitatively. Since a fixed amount of iodine is liberated for a given amount of carbon monoxide, the concentration of CO can be determined accurately.
Step 3: Eliminate other options \[ Cl_2O_7,\ BrO_3,\ I_2O_7 \] are not used for this analytical estimation. The standard reagent is: \[ \boxed{I_2O_5} \] Hence the correct answer is \[ \boxed{\text{(D)}} \]
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