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A KI solution containing starch turns blue on the addition of chlorine. Which of the following statements explain this:

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The reduction potential of Cl₂ is more than that of I₂

The oxidation potential of Cl₂ is more than that of l₂

The product formed when Cl₂ combines with starch is blue in colour.

The product formed when I₂ combines with starch is blue in colour.

answer is A, D.

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Detailed Solution

Chlorine is placed below iodine in electrochemical series, so Cl₂ undergoes reduction and I^- undergoes oxidation.

$2 I^{-} \to I_{2} + 2 e^{-} {Cl}_{2} + 2 e^{-} \to 2 {Cl}^{-} {Cl}_{2} + 2 I^{-} \to I_{2} + 2 {Cl}^{-}$

So, iodine absorbed in reaction which changes the starch color changes to blue.

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