Which of the following statements about magnetite ore of iron is/are correct ? 1. It is known as black ore. 2. It contains 60% to 70% of pure iron. 3. It possesses magnetic properties. Select the correct answer using the codes given below ;

Magnetite (Fe3O4) is a high-grade iron ore characterized by several distinct properties. It is commonly referred to as 'black ore' due to its dark, blackish appearance [3]. Regarding its iron content, it is considered the finest iron ore, typically containing between 60% and 70% pure iron [3]. Some sources even specify its maximum theoretical iron content at approximately 72.4%. Furthermore, magnetite is renowned for its superior magnetic properties, making it highly valuable in the electrical industry [2]. It is the most strongly magnetic mineral found in nature, often acting as a natural magnet [2]. Since all three statements regarding its nomenclature as black ore, its iron content range, and its magnetic characteristics are accurate, the correct answer is option 4.

Sources

1. [2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 28: Manufacturing Industry and The Iron and Steel Industry > Types of lron Ore > p. 284
2. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 7: Resources > Natural Resources of India > p. 8
3. [1] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 5: Print Culture and the Modern World > Iron Ore > p. 107