To the aqueous solution containing bromide and iodide ions, if chlorine water is added first violet colour appears, but on adding excess of chlorine water, the violet colour disappears followed by appearance of orange red colour. The number of electrons involved in this process is (calculate per halogen atoms of I and Br in balanced chemical reaction)

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answer is 7.

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Detailed Solution

$2 K I + C l_{2} \to 2 K C l + I_{2} I_{2} + 6 H_{2} O + 5 C l_{2} \to 2 H I O_{3} + 10 H C l 2 K B r + C l_{2} \to 2 K C l + B r_{2}$

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