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Preparation of Carboxylic Acids

When Cl2 wa...

Question

When $C l_{2}$ water is added to an aqueous solution of potassium halide in presence of chloro form a violet colour is obtained on adding more of $C l_{2}$ water; the violet colour disappears and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution :

A

Iodide

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B

Bromide

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C

Chloride

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D

Bromide and chloride

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Solution

The correct option is A Iodide
Acidify the Lassaigne’s extract with nitric acid and add a few drops of freshly prepared chlorine water. Free ${B r}_{2}, I_{2}$ will be evolved. Shake this solution with carbon disulphide or carbon tetrachloride. The liberated halogens ( ${B r}_{2}, I_{2}$ ) will dissolve in it giving as orange or brown colour for bromine and violet colour for iodine.
$2 N a B r + {C l}_{2} ⟶ 2 N a C l + {B r}_{2} (B r o w n) 2 N a I + {C l}_{2} ⟶ 2 N a C l + I_{2} (V i o l e t)$

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