試題詳解

7. A solution contains the ions Ag⁺, .Dilute solutions of NaCI, Na₂SO₄, and Na₂S are available to separate the positive ions from each other. In order to effect separation, the solutions should be added in which order?
(A) Na₂S, NaCI, Na₂SO₄
(B) Na₂SO₄, NaCI,Na₂S
(C) Na₂SO₄, Na₂S, NaCI
(D) NaCI, Na₂S, Na₂SO₄
(E) NaCI, Na₂SOa,Na₂S