Which One of the Following Ionic Compounds Has an Incorrect

question 127

Multiple Choice

Which one of the following ionic compounds has an incorrect formula or is not named correctly?

• A)CoO, cobalt oxide
• B)Co₂O₃, cobalt(III) oxide
• C)CoO₂, cobalt(IV) oxide
• D)Cu₂S, copper(I) sulfide
• E)MgS, magnesium sulfide

---

Definitions:

Deposits

Sediments, minerals, or other substances that have been accumulated or left behind, typically by water, wind, or ice.

Lake

A large body of water surrounded by land, not directly connected to the sea.

Limestone

A sedimentary rock composed predominantly of calcium carbonate, principally in the form of calcite, and which may include chert, dolomite, and fine-grained clastic sediment.

Coral Reef

A marine ecosystem characterized by bio-constructed calcium carbonate structures built by coral organisms, often hosting diverse marine life.