Answer: escaping SO 2 gas produces blisters on its surface.
- A escaping SO<sub>2</sub> gas produces blisters on its surface
- B it blisters the skin badly on contact
- C it holds blister-like copper sulfide crystals
- D it is coated with a blister of copper sulfate
Correct answer: A. escaping SO<sub>2</sub> gas produces blisters on its surface
Explanation: As molten copper from the converter solidifies, dissolved SO<sub>2</sub> escapes and forms blisters on the surface, giving the product the name blister copper (about 98% pure).
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.