Aqueous solutions of a compound did not form precipitates with Cl^-,Br^-,I^-,SO₄^2-,CO₃^2-,PO₄^3-,OH^-,or S^2-.This highly water-soluble compound produced the foul-smelling gas H₂S when the solution was acidified.This compound is ________. A)Pb(NO₃)₂ B)(NH₄)₂S C)KBr D)Li₂CO₃ E)AgNO₃

Question

Quizplus · Accepted Answer

The fact that the compound did not form precipitates with Cl-, Br-, I-, SO42-, CO32-, PO43-, OH-, or S2- suggests that it is a highly water-soluble compound with no common ion with any of these anions. The fact that it produced a foul-smelling gas (H2S) when acidified indicates that it contains a sulfide ion (S2-). The only compound among the choices that fits these criteria is (NH4)2S, which dissociates into NH4+ and S2- ions in water. The NH4+ ion is highly soluble and does not form precipitates with any of the anions listed, and the S2- ion reacts with an acid (such as HCl) to produce H2S gas. Therefore, the correct answer is B, (NH4)2S.

Aqueous Solutions of a Compound Did Not Form Precipitates with Cl-,Br-,I-,SO42-,CO32-,PO43-,OH-,or

Aqueous Solutions of a Compound Did Not Form Precipitates with Cl^-,Br^-,I^-,SO₄^2-,CO₃^2-,PO₄^3-,OH^-,or