Question

What do you observes when:
Moist blue litmus paper is introduced in the jar of Chlorine?

Answer 1

The following reactions will take place when Moist blue litmus paper is introduced in the jar of Chlorine

$C{l}_2+H_{2}O\to HOCl+HCl$.

$HCl+H_{2}O\to H_3{O}^{+}+C{l}^{-}$

Since $H3O^{+}$ has been produced, the moist blue litmus paper will turn into red.