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Why the chloroform layer becomes purple, when a colourless solution of potassium iodide is passed through a colourless solution of chloroform?

Why the chloroform layer becomes purple, when a colourless solution of potassium iodide is passed through a colourless solution of chloroform? Correct Answer Iodine

The iodine so liberated, dissolves in the chloroform, giving it a purple colour. 2KI + Cl2 –> 2KCl + I2 (Iodine)

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