Chemistry - Metallurgy Question with Solution | TestHub
Select the CORRECT statement(s) :
Options:(select one or more)
Answer:
Solution:
A. Cassiterite (SnO₂) is weakly magnetic and can be concentrated by magnetic separation to remove non-magnetic gangue. This statement is CORRECT.
B. Roasting converts metal sulfides to oxides or sulfates. In some cases, like copper or lead, partial roasting allows unroasted sulfide to reduce the oxide (self-reduction). This statement is CORRECT.
C. The Hall-Heroult process involves the electrolytic reduction of alumina (Al₂O₃) to aluminum. The overall reaction is . The given reaction is incorrect. This statement is INCORRECT.
D. Boron, silicon, and germanium are semiconductors purified by zone refining, which is based on the principle that impurities are more soluble in the melt than in the solid. This statement is CORRECT.
