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  • Where chlorine water is added to an aqueous solution of potassium halide in presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and

Where chlorine water is added to an aqueous solution of potassium halide in presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution

Option: 1

lodide


Option: 2

Bromide


Option: 3

Chloride


Option: 4

lodide and bromide


Answers (1)

best_answer

The given reaction is a test for Iodide ions.

\text {Cl}_{2} oxidises \text {I}^{-} into \text {I}_{2} which gives violet coloration in the organic layer.

\mathrm{2 KI + Cl _{2} \longrightarrow 2 KCl + I _{2}}

Upon adding excess of Chlorine water, the dissolved \mathrm{I_2} is oxidised to Iodate ions \mathrm{IO_3^-} which is colourless

\mathrm{{5 Cl _{2}}+ \underset{Violet}{I _{2}}+6 H _{2} O \rightarrow \underset{\text { Colorless }}{2 HIO _{3}}+10 HCl}

Hence, the correct answer is Option (1)

Posted by

seema garhwal

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