. WhenC12 water is added to an aqueous solution
of potassium halide in presence of chloro form a violet colour is obtained on adding more ofC12 water
; the violet colour disappears and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution :
D: Bromide and chloride
When the reagent is introduced dropwise to an iodide solution, free iodine is liberated, which turns the solution brown and dissolves in
the organic layer, generating a violet solution that sinks below the aqueous layer after shaking with .CS2,CHC13 or CC14
2KI + C12 → I2+ 2KC1
I2 + Chloroform → Violet solution
Hence, the test confirms the presence of iodide in the aqueous solution.
The correct option is A, i.e. iodide.