Question

Few drops of a salt solution are shaken with chloroform, chlorine water. Chloroform layer becomes violet. Solution contains :

• A. $N{O}_2^{-}$ ion
• B. $N{O}_3^{-}$ ion
• C. $B{r}^{-}$ ion
• D. $I^{-}$ ion

Answer 1

Answer: (D)

$I^{-}$ ion

Few drops of a salt solution are shaken with chloroform, chlorine water. The chloroform layer becomes violet. Solution contains $I^{-}$.

Adding 1 mL of $CHC{l}_3$ and chlorine water in excess to the salt solution in water or sodium carbonate extract neutralized with dil.HCl and shake the test tube vigorously.

The presence of violet colouration in the organic layer confirms the presence of iodide ions.

$2KI+C{l}_2⟶2KCl+I_2$;

$I_2+CC{l}_4⟶Violetsolution$.

So, the corret option is $D$