Question

What happens when blue litmus paper is dipped into chlorine water?

• A. Paper becomes red
• B. Paper becomes white
• C. Paper remains blue
• D. Paper dissolves

Answer 1

Answer: (A)

Chlorine water on standing initially gives an amount of hypochlorous acid $HOCl$. So, the color of the litmus paper will change from blue to red. After some time $HCl$ and $HCl{O}_3$ will be produced and both of them are acidic.

$C{l}_2+H_{2}O⟶HCl{O}_3+HCl$

Hence, option $A$ is correct.