A Solution Contains the Ions Ag⁺, Pb²⁺, and Ni²⁺

question 8

Multiple Choice

A solution contains the ions Ag⁺, Pb²⁺, and Ni²⁺. Dilute solutions of NaCl, 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, NaCl, Na₂SO₄
• B) Na₂SO₄, NaCl, Na₂S
• C) Na₂SO₄, Na₂S, NaCl
• D) NaCl, Na₂S, Na₂SO₄
• E) NaCl, Na₂SO₄, Na₂S

---

Definitions:

Travertine

A variety of limestone that is commonly concentrically banded and porous.

Karst Topography

A landscape formed from the dissolution of soluble rocks such as limestone, characterized by sinkholes, caves, and underground drainage systems.

Sinkhole

A depression or hole in the ground caused by the collapse of a surface layer, often due to the dissolution of underlying limestone, volcanic activity, or water withdrawal from wells.

Stalactite

A type of speleothem that hangs from the ceiling of limestone caves, formed by the deposition of minerals from dripping water.