Iron ore types MCQ - Practice Questions with Answers

Siderite is an iron carbonate ore, chemically represented as iron(II) carbonate. Haematite is mainly iron oxide and is one of the richest common iron ores, but it is not a carbonate. Magnetite is also an iron oxide, known for its magnetic property. Limonite is a hydrated iron oxide mixture rather than iron carbonate. Since the question specifically asks for the ore known as iron carbonate, Siderite alone fits the description.

Lignite is not an iron ore; it is a low-grade form of coal, commonly called brown coal. Siderite is an iron carbonate ore and is included among recognised iron ores. Limonite is a hydrated iron oxide ore and is also a source of iron. Magnetite is a major iron ore with high iron content and strong magnetic properties. Since the question asks for the item that is not a type of iron ore, lignite is the correct answer according to the official key.