Which Major Islands and Minerals of the World term is correctly associated with location or primary association: “the principal ore of tin”, and also with “a tin oxide mineral with formula SnO2”?

Correct Answer: Option C — Cassiterite. Cassiterite is correct because it is the principal ore of tin. Cassiterite is also associated with a tin oxide mineral with formula SnO2. A further identifying fact is that Cassiterite is the principal ore of tin. Another useful fact is that Cassiterite is associated with a tin oxide mineral with formula SnO2. Why the other options are incorrect: Option A — 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. Option B — Pyrolusite: It is an important ore of manganese and is associated with mainly manganese dioxide, MnO2; those are the identifying facts of Pyrolusite. Option D — Gypsum: It is a hydrated calcium sulphate mineral and is associated with used in plaster and cement manufacture; those are the identifying facts of Gypsum. Exam Takeaway: Link Cassiterite with “the principal ore of tin” and “a tin oxide mineral with formula SnO2” for quick revision.