The Chromyl Chloride Test is a specific confirmatory test for the Chloride ($C{l}^{-}$) ion.

• Reaction: Salt mixed with solid $K_{2}C{r}_2{O}_7$ and concentrated $H_{2}S{O}_4$ and heated.
• Result: Formation of deep red vapors of Chromyl Chloride ($Cr{O}_{2}C{l}_2$).
• Confirmatory: Vapors passed through $NaOH$ give a yellow solution (Sodium chromate), which yields a yellow precipitate of Lead chromate ($PbCr{O}_4$) upon adding acetic acid and lead acetate.
• Note: Bromides and Iodides do not give this test; instead, they are oxidized to free halogens ($B{r}_2$ or $I_2$).