Which Major Islands and Minerals of the World term is correctly associated with location or primary association: “the principal ore of lead”, and also with “a lead sulphide mineral with formula PbS”?

Correct Answer: Option C — Galena. Galena is correct because it is the principal ore of lead. Galena is also associated with a lead sulphide mineral with formula PbS. A further identifying fact is that Galena is the principal ore of lead. Another useful fact is that Galena is associated with a lead sulphide mineral with formula PbS. Why the other options are incorrect: Option A — Sphalerite: It is the principal ore of zinc and is associated with a zinc sulphide mineral; those are the identifying facts of Sphalerite. Option B — Cassiterite: It is the principal ore of tin and is associated with a tin oxide mineral with formula SnO2; those are the identifying facts of Cassiterite. Option D — Chromite: It is the principal ore of chromium and is associated with important for stainless steel and alloy production; those are the identifying facts of Chromite. Exam Takeaway: Link Galena with “the principal ore of lead” and “a lead sulphide mineral with formula PbS” for quick revision.