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JEE Advanced levelSingle correct optionDifficulty 3 of 3ph041

Chlorine water is added dropwise to a solution of $NaI$ shaken with carbon tetrachloride, and then added in large excess with shaking. The observation in the $CCl X_{4}$ layer is

Ait turns violet first, and the colour later disappears
Bit stays colourless throughout
Cit turns orange-red first, and the colour later turns violet
Dit turns violet, and the colour then deepens with more chlorine

Answer: A

Small amounts of

Cl X_{2}

oxidise

I X^{-}

to

I X_{2}

, which dissolves in

CCl X_{4}

to give violet. Excess chlorine water oxidises

I X_{2}

further:

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

, and the colourless

HIO X_{3}

goes into the aqueous layer.

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