Which of the following statements is/are correct regarding the detection of halogens via the layer t — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

In the layer test, $Cl_2$ is a stronger oxidizing agent than $Br_2$ and $I_2$, so it displaces them from their salts. Liberated $I_2$ dissolves in $CHCl_3$ giving a violet layer, and $Br_2$ gives a brown layer. When excess $Cl_2$ water is added, it further oxidizes $I_2$ to colorless iodic acid ($HIO_3$). However, $Br_2$ is not as easily oxidized to a colorless species under these conditions, so the brown/yellow color persists longer and does not disappear as readily as iodine.