Question

Which of the following oxide of iodine is used in the estimation of carbon monoxide?

• A. ${\mathrm{I}}_2{\mathrm{O}}_4$
• B. ${\mathrm{I}}_2{\mathrm{O}}_5$
• C. ${\mathrm{I}}_2{\mathrm{O}}_6$
• D. ${\mathrm{I}}_2{\mathrm{O}}_7$

Answer 1

The correct option is B

${\mathrm{I}}_2{\mathrm{O}}_5$

Explanation of the correct option:

(B) ${\mathrm{I}}_2{\mathrm{O}}_5$

• ${\mathrm{I}}_2{\mathrm{O}}_5$ is used for the determination of carbon monoxide$\left(\mathrm{CO}\right)$ in the gaseous condition and gives carbon dioxide$\left({\mathrm{CO}}_2\right)$ and solid iodine$\left({\mathrm{I}}_2\right)$.
• The chemical reaction can be depicted as:

${\mathrm{I}}_2{\mathrm{O}}_5\left(\mathrm{s}\right)+5\mathrm{CO}\left(\mathrm{g}\right)\to {\mathrm{I}}_2\left(\mathrm{s}\right)+5{\mathrm{CO}}_2\left(\mathrm{g}\right)$

Explanation of incorrect options:

(A) ${\mathrm{I}}_2{\mathrm{O}}_4$

• ${\mathrm{I}}_2{\mathrm{O}}_4$ is decomposes at ${100}^{\circ }$C and is not used in the estimation of carbon monoxide$\left(\mathrm{CO}\right)$.

(C) ${\mathrm{I}}_2{\mathrm{O}}_6$

• ${\mathrm{I}}_2{\mathrm{O}}_6$ does not react with carbon monoxide $\left(\mathrm{CO}\right)$.

(D) ${\mathrm{I}}_2{\mathrm{O}}_7$

• ${\mathrm{I}}_2{\mathrm{O}}_7$ is acidic and it reacts with water and forms periodic acid.

Hence, option (B) is correct., ${\mathrm{I}}_2{\mathrm{O}}_5$ oxide of iodine is used in the estimation of carbon monoxide.