Question

When $SO_{2}$ is passed through an aqueous solution of $I_{2}$ , it becomes colourless. This is due to

• A. bleaching reaction of $SO_{2}$
• B. formation of $\text{HIO}_{\text{2}}$
• C. combination of $SO_{2}$ and $I_{2}$
• D. formation of $HNO_{3}$

Answer 1

Answer: (C)

When $SO_{2}$ is passed through an aqueous solution of $I_{2}$ , it becomes colourless. This is due to combination of $SO_{2}$ and $I_{2}$ as follows
$SO_{2}+2H_{2}O+I_{2} \rightarrow H_{2}SO_{4}+2HI$