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Буклет 2013 року

In order to detect the presence of thiosulfate ions a pharmaceutical analyst added the excess reagent. The resulting reaction produced a white precipitate, which slowly turned yellow, then brown, and black. What solution was added?
  • Ammonium oxalate
  • Barium chloride
  • Diphenylamine
  • Lead (II) acetate
  • Silver nitrate

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