The sodium extract of an organic compound, acidified with dilute HNO3 and boiled, gives a yellow precipitate with AgNO3 that does not dissolve in conc. aqueous ammonia. The element and the precipitate are

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The sodium extract of an organic compound, acidified with dilute $HNO X_{3}$ and boiled, gives a yellow precipitate with $AgNO X_{3}$ that does not dissolve in conc. aqueous ammonia. The element and the precipitate are

AgCl

is white and dissolves in dilute ammonia,

AgBr

is pale yellow and only sparingly soluble in conc. ammonia, while

AgI

is yellow and insoluble even in conc. ammonia. The observation therefore indicates iodine.

Ag X_{2} S

would be black and is removed by boiling.