Question

What happens when chlorine gas is passed in an aqueous solution containing sodium iodide?

Answer 1

1. When chlorine is added to sodium iodide the Iodine gets displaced by chlorine.
2. The reactivity of chlorine is more than that of Iodine hence chlorine easily displaces Iodine from sodium Iodide.
3. Thus forming sodium chloride.
4. The reaction is,

$\underset{SodiumIodide}{2NaI\left(aq\right)}+\underset{Chlorine}{C{l}_2\left(g\right)}\to \underset{Sodiumchloride}{2NaCl\left(aq\right)}+\underset{Iodine}{I_2\left(g\right)}$

So when chlorine gas is passed in an aqueous solution containing sodium iodide, iodine is displaced by chlorine from sodium iodide.