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Explain the test for detection of halogens by Lassaigne’s is filtrate.

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Silver nitrate test: A portion of the stock solution is boiled with dil. HNO3, cooled and silver nitrate is added. A white precipitate soluble in ammonium hydroxide shows the presence of chlorine. A pale yellow precipitate slightly in ammonium hydroxide shows the presence of bromine. A yellow precipitate insoluble in ammonium hydroxide shows the presence of iodine.

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