Which of these commonly used metals must be smelted from its ore minerals in the presence of carbon monoxide gas (from the burning of carbon-based charcoal)?
A) aluminum
B) copper
C) iron
D) tin

Question

Quizplus · Accepted Answer

Iron must be smelted from its ore minerals in the presence of carbon monoxide gas (CO) in a process called reduction. The CO reacts with the iron oxide in the ore, reducing it to pure iron while also producing carbon dioxide gas (CO2). Aluminum, copper, and tin can be extracted through other processes such as electrolysis or by heating with other chemicals, and do not necessarily require carbon monoxide for extraction.

Which of These Commonly Used Metals Must Be Smelted from Its