Aqueous solutions of a compound did not form precipitates with - - - 2- 2- 3- - 2- Cl , Br , I , SO4 , CO3 , PO4 , OH , or S . This highly water-soluble compound produced the foul-smelling gas H2S when the solution was acidified. This compound is __________.

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Aqueous solutions of a compound did not form precipitates with - - - 2- 2- 3- - 2- Cl , Br , I , SO<sub>4</sub> , CO<sub>3</sub> , PO<sub>4</sub> , OH , or S . This highly water-soluble compound produced the foul-smelling gas H<sub>2</sub>S when the solution was acidified. This compound is __________.