The correct option is 2 and 3 only.
Explanation
Iron ore is the backbone of modern industrial development. The quality of iron ore is determined by its iron content and chemical composition. The four main types of iron ore found in India are Magnetite, Hematite, Limonite, and Siderite.
Statement-wise Analysis:
- Statement 1 is Incorrect: Magnetite is considered the finest iron ore with a very high content of iron, typically up to 70-72 %. Hematite, while a high-quality ore, generally has a slightly lower iron content (ranging between 50 and 60 %) compared to Magnetite.
- Statement 2 is Correct: As the name suggests, Magnetite possesses excellent magnetic qualities. This specific property makes it highly valuable in the electrical industry, particularly for manufacturing electromagnets and other electrical equipment.
- Statement 3 is Correct: Despite having slightly lower iron content than Magnetite, Hematite is the most important industrial iron ore in terms of the quantity used. It is widely available and forms the bulk of the iron ore consumed by industries.
Key Takeaway:
Magnetite is the highest quality ore (highest iron content, magnetic properties), whereas Hematite is the most commercially and industrially significant ore due to its abundance and extensive usage.