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Q.

To detect iodine in presence of bromine, the sodium extract is treated with ${NaNO}_{2}$ + glacial acetic acid + ${CCl}_{4}$ . Iodine is detected by the appearance of

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a

$yellow colour of {CCl}_{4} layer$

b

$purple colour of {CCl}_{4}$

c

$brown colour in the organic layer of {CCl}_{4}$

d

$deep blue colour in {CCl}_{4}$

answer is B.

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Detailed Solution

$2 NaI + 2 {NaNO}_{2} + 4 {CH}_{3} COOH ⟶ I_{2} + 2 NO +$ $4 {CH}_{3} COONa + 2 H_{2} O$

The colour of ${CCl}_{4}$ layer turns purple due to liberated $I_{2}$ .

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To detect iodine in presence of bromine, the sodium extract is treated with NaNO2+ glacial acetic acid + CCl4. Iodine is detected by the appearance of