SAQ : Hematite is the ore of iron, but iron pyrites is not, why? 

Question

Hematite is the ore of iron, but iron pyrites is not, why? 

Answer

Iron pyrites (FeS₂) is not an ore of iron because it does not contain a sufficient amount of iron. Hematite (Fe₂O₃) is an ore of iron because it contains a high percentage of iron in its composition.