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Colour of KI solution containing starch turns blue when Cl2 water is added. Explain.

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Colour of KI solution containing starch turns blue when Cl2 water is added. Explain.

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Chlorine is placed below iodine in electrochemical series having higher E0Red and thus undergoes reduction whereas I- undergoes oxidation. 

The I2 so formed gets absorbed in starch to give blue colour. 

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