anion detection

Question

Chromyl chloride test is used to detect:

RankGuru · Accepted Answer

The **Chromyl Chloride Test** is a specific confirmatory test for the **Chloride ($Cl^-$)** ion.
- **Reaction**: Salt mixed with solid $K_2Cr_2O_7$ and concentrated $H_2SO_4$ and heated.
- **Result**: Formation of **deep red vapors** of **Chromyl Chloride ($CrO_2Cl_2$)**.
- **Confirmatory**: Vapors passed through $NaOH$ give a yellow solution (Sodium chromate), which yields a **yellow precipitate** of Lead chromate ($PbCrO_4$) upon adding acetic acid and lead acetate.
- Note: Bromides and Iodides do not give this test; instead, they are oxidized to free halogens ($Br_2$ or $I_2$).

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anion detection

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