Chlorine water is added dropwise, with shaking, to a solution containing iodide, with a little CCl4 present. The CCl4 layer first turns violet. On adding excess chlorine water the violet colour disappears. The final iodine species and its oxidation state are

JEE Main levelSingle correct optionDifficulty 2 of 3qa040

Chlorine water is added dropwise, with shaking, to a solution containing iodide, with a little $CCl X_{4}$ present. The $CCl X_{4}$ layer first turns violet. On adding excess chlorine water the violet colour disappears. The final iodine species and its oxidation state are

First

2 I X^{-} + Cl X_{2} I X_{2} + 2 Cl X^{-}

gives violet

I X_{2}

in CCl4. Excess chlorine oxidises it:

I X_{2} + 5 Cl X_{2} + 6 H X_{2} O 2 HIO X_{3} + 10 HCl

, giving colourless iodic acid with I in +5.