Answer: A naturally occurring mineral from which a metal can be profitably extracted.
- A A naturally occurring mineral from which a metal can be profitably extracted
- B Generally any rock found in the Earth's crust regardless of metal content
- C A largely purified metal ready for direct industrial use in typical laboratory settings
- D Any metal compound, regardless of whether extraction is economical under usual circumstances
Correct answer: A. A naturally occurring mineral from which a metal can be profitably extracted
Explanation: An ore is a naturally occurring rock or mineral from which a metal can be extracted economically.
An Ellingham diagram plots ΔG° of oxide formation against temperature for different metals; whichever line is LOWER (more negative ΔG°) at a given temperature reduces the oxide of any metal whose line sits above it - the basis of carbon reduction (Fe, Zn) vs electrolytic reduction (Al, Mg, Na) decisions.
Concept context
The science of extracting metals from ores and refining them for use. Covers concentration methods, reduction techniques, refining processes, and the thermodynamic principles that govern metal extraction.