1.

Explain the method used for the detection of halogens.

Answer»

The sodium fusion extract is acidified with nitric acid and then treated with silver nitrate. A white precipitate, soluble in ammonium hydroxide shows the presence of chlorine, a yellowish precipitate, sparingly soluble in ammonium hydroxide shows the presence of bromine and a yellow precipitate, insoluble in ammonium hydroxide shows the presence of iodine.

X + Ag+ ⎯→ AgX

X represents a halogen – Cl, Br or I.



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