Iron ore occurrence: usual chemical form in nature Considering common commercial iron ores, identify the chemical class in which iron is usually found. Choose the correct option.

Concept

• Commercial iron ores are predominantly oxides/hydroxides: haematite (Fe₂O₃), magnetite (Fe₃O₄), limonite/goethite (hydrated oxides).
• Carbonate (siderite, FeCO₃) exists but is less common as a primary commercial ore; sulphides (e.g., pyrite) are not typical iron ores due to sulphur problems.

Final AnswerOxides