During the layer test for halogens, excess chlorine water is added to a mixture containing ions and — Qualitative and Quantitative Analysis Chemistry Question
Question
During the layer test for halogens, excess chlorine water is added to a mixture containing $I^-$ ions and chloroform. The initial violet color of the organic layer completely disappears upon excess addition. This is chemically due to the formation of:
Answer: C
💡 Solution & Explanation
Chlorine is a stronger oxidizing agent than iodine. Initially, $Cl_2$ oxidizes $I^-$ to $I_2$ (giving the violet layer). When excess $Cl_2$ is added, it further oxidizes the elemental iodine into iodic acid ($HIO_3$), which is colorless.
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